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// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";

import "../../interfaces/IYearn.sol";
import "../../interfaces/IYvault.sol";
import "../../interfaces/IDaoVault.sol";

/// @title Contract for yield token in Yearn Finance contracts
/// @dev This contract should not be reused after vesting state
contract YearnFarmerUSDTv2 is ERC20, Ownable {
  /**
   * @dev Inherit from Ownable contract enable contract ownership transferable
   * Function: transferOwnership(newOwnerAddress)
   * Only current owner is able to call the function
   */

  using SafeERC20 for IERC20;
  using Address for address;
  using SafeMath for uint256;

  IERC20 public token;
  IYearn public earn;
  IYvault public vault;
  uint256 private constant MAX_UNIT = 2**256 - 2;
  mapping (address => uint256) private earnDepositBalance;
  mapping (address => uint256) private vaultDepositBalance;
  uint256 public pool;

  // Address to collect fees
  address public treasuryWallet = 0x59E83877bD248cBFe392dbB5A8a29959bcb48592;
  address public communityWallet = 0xdd6c35aFF646B2fB7d8A8955Ccbe0994409348d0;

  uint256[] public networkFeeTier2 = [50000e6+1, 100000e6]; // Represent [tier2 minimun, tier2 maximun], initial value represent Tier 2 from 50001 to 100000
  uint256 public customNetworkFeeTier = 1000000e6;

  uint256 public constant DENOMINATOR = 10000;
  uint256[] public networkFeePercentage = [100, 75, 50]; // Represent [Tier 1, Tier 2, Tier 3], initial value represent [1%, 0.75%, 0.5%]
  uint256 public customNetworkFeePercentage = 25;
  uint256 public profileSharingFeePercentage = 1000;
  uint256 public constant treasuryFee = 5000; // 50% on profile sharing fee
  uint256 public constant communityFee = 5000; // 50% on profile sharing fee

  bool public isVesting;
  IDaoVault public daoVault;

  event SetTreasuryWallet(address indexed oldTreasuryWallet, address indexed newTreasuryWallet);
  event SetCommunityWallet(address indexed oldCommunityWallet, address indexed newCommunityWallet);
  event SetNetworkFeeTier2(uint256[] oldNetworkFeeTier2, uint256[] newNetworkFeeTier2);
  event SetNetworkFeePercentage(uint256[] oldNetworkFeePercentage, uint256[] newNetworkFeePercentage);
  event SetCustomNetworkFeeTier(uint256 indexed oldCustomNetworkFeeTier, uint256 indexed newCustomNetworkFeeTier);
  event SetCustomNetworkFeePercentage(uint256 indexed oldCustomNetworkFeePercentage, uint256 indexed newCustomNetworkFeePercentage);
  event SetProfileSharingFeePercentage(uint256 indexed oldProfileSharingFeePercentage, uint256 indexed newProfileSharingFeePercentage);

  constructor(address _token, address _earn, address _vault)
    ERC20("Yearn Farmer v2 USDT", "yfUSDTv2") {
      _setupDecimals(6);
      
      token = IERC20(_token);
      earn = IYearn(_earn);
      vault = IYvault(_vault);

      _approvePooling();
  }

  /**
   * @notice Set Vault that interact with this contract
   * @dev This function call after deploy Vault contract and only able to call once
   * @dev This function is needed only if this is the first strategy to connect with Vault
   * @param _address Address of Vault
   * Requirements:
   * - Only owner of this contract can call this function
   * - Vault is not set yet
   */
  function setVault(address _address) external onlyOwner {
    require(address(daoVault) == address(0), "Vault set");

    daoVault = IDaoVault(_address);
  }

  /**
   * @notice Set new treasury wallet address in contract
   * @param _treasuryWallet Address of new treasury wallet
   * Requirements:
   * - Only owner of this contract can call this function
   */
  function setTreasuryWallet(address _treasuryWallet) external onlyOwner {
    address oldTreasuryWallet = treasuryWallet;
    treasuryWallet = _treasuryWallet;
    emit SetTreasuryWallet(oldTreasuryWallet, _treasuryWallet);
  }

  /**
   * @notice Set new community wallet address in contract
   * @param _communityWallet Address of new community wallet
   * Requirements:
   * - Only owner of this contract can call this function
   */
  function setCommunityWallet(address _communityWallet) external onlyOwner {
    address oldCommunityWallet = communityWallet;
    communityWallet = _communityWallet;
    emit SetCommunityWallet(oldCommunityWallet, _communityWallet);
  }

  /**
   * @notice Set network fee tier
   * @notice Details for network fee tier can view at deposit() function below
   * @param _networkFeeTier2  Array [tier2 minimun, tier2 maximun], view additional info below
   * Requirements:
   * - Only owner of this contract can call this function
   * - First element in array must greater than 0
   * - Second element must greater than first element
   */
  function setNetworkFeeTier2(uint256[] calldata _networkFeeTier2) external onlyOwner {
    require(_networkFeeTier2[0] != 0, "Minimun amount cannot be 0");
    require(_networkFeeTier2[1] > _networkFeeTier2[0], "Maximun amount must greater than minimun amount");
    /**
     * Network fees have three tier, but it is sufficient to have minimun and maximun amount of tier 2
     * Tier 1: deposit amount < minimun amount of tier 2
     * Tier 2: minimun amount of tier 2 <= deposit amount <= maximun amount of tier 2
     * Tier 3: amount > maximun amount of tier 2
     */
    uint256[] memory oldNetworkFeeTier2 = networkFeeTier2;
    networkFeeTier2 = _networkFeeTier2;
    emit SetNetworkFeeTier2(oldNetworkFeeTier2, _networkFeeTier2);
  }

  /**
   * @notice Set network fee in percentage
   * @param _networkFeePercentage An array of integer, view additional info below
   * Requirements:
   * - Only owner of this contract can call this function
   * - Each of the element in the array must less than 4000 (40%) 
   */
  function setNetworkFeePercentage(uint256[] calldata _networkFeePercentage) external onlyOwner {
    /** 
     * _networkFeePercentage content a array of 3 element, representing network fee of tier 1, tier 2 and tier 3
     * For example networkFeePercentage is [100, 75, 50]
     * which mean network fee for Tier 1 = 1%, Tier 2 = 0.75% and Tier 3 = 0.5%
     */
    require(
      _networkFeePercentage[0] < 4000 &&
      _networkFeePercentage[1] < 4000 &&
      _networkFeePercentage[2] < 4000, "Network fee percentage cannot be more than 40%"
    );

    uint256[] memory oldNetworkFeePercentage = networkFeePercentage;
    networkFeePercentage = _networkFeePercentage;
    emit SetNetworkFeePercentage(oldNetworkFeePercentage, _networkFeePercentage);
  }

  /**
   * @notice Set network fee tier
   * @param _customNetworkFeeTier Integar
   * @dev Custom network fee tier is checked before network fee tier 3. Please check networkFeeTier[1] before set.
   * Requirements:
   * - Only owner of this contract can call this function
   * - Custom network fee tier must greater than network fee tier 2
   */
  function setCustomNetworkFeeTier(uint256 _customNetworkFeeTier) external onlyOwner {
    require(_customNetworkFeeTier > networkFeeTier2[1], "Custom network fee tier must greater than tier 2");

    uint256 oldCustomNetworkFeeTier = customNetworkFeeTier;
    customNetworkFeeTier = _customNetworkFeeTier;
    emit SetCustomNetworkFeeTier(oldCustomNetworkFeeTier, _customNetworkFeeTier);
  }

  /**
   * @notice Set custom network fee
   * @param _percentage Integar (100 = 1%)
   * Requirements:
   * - Only owner of this contract can call this function
   * - Amount set must less than network fee for tier 2
   */
  function setCustomNetworkFeePercentage(uint256 _percentage) public onlyOwner {
    require(_percentage < networkFeePercentage[2], "Custom network fee percentage cannot be more than tier 2");

    uint256 oldCustomNetworkFeePercentage = customNetworkFeePercentage;
    customNetworkFeePercentage = _percentage;
    emit SetCustomNetworkFeePercentage(oldCustomNetworkFeePercentage, _percentage);
  }

  /**
   * @notice Set profile sharing fee
   * @param _percentage Integar (100 = 1%)
   * Requirements:
   * - Only owner of this contract can call this function
   * - Amount set must less than 4000 (40%)
   */
  function setProfileSharingFeePercentage(uint256 _percentage) public onlyOwner {
    require(_percentage < 4000, "Profile sharing fee percentage cannot be more than 40%");

    uint256 oldProfileSharingFeePercentage = profileSharingFeePercentage;
    profileSharingFeePercentage = _percentage;
    emit SetProfileSharingFeePercentage(oldProfileSharingFeePercentage, _percentage);
  }

  /**
   * @notice Approve Yearn Finance contracts to deposit token from this contract
   * @dev This function only need execute once in contract contructor
   */
  function _approvePooling() private {
    uint256 earnAllowance = token.allowance(address(this), address(earn));
    if (earnAllowance == uint256(0)) {
      token.safeApprove(address(earn), MAX_UNIT);
    }
    uint256 vaultAllowance = token.allowance(address(this), address(vault));
    if (vaultAllowance == uint256(0)) {
      token.safeApprove(address(vault), MAX_UNIT);
    }
  }

  /**
   * @notice Get Yearn Earn current total deposit amount of account (after network fee)
   * @param _address Address of account to check
   * @return result Current total deposit amount of account in Yearn Earn. 0 if contract is in vesting state.
   */
  function getEarnDepositBalance(address _address) external view returns (uint256 result) {
    result = isVesting ? 0 : earnDepositBalance[_address];
  }

  /**
   * @notice Get Yearn Vault current total deposit amount of account (after network fee)
   * @param _address Address of account to check
   * @return result Current total deposit amount of account in Yearn Vault. 0 if contract is in vesting state.
   */
  function getVaultDepositBalance(address _address) external view returns (uint256 result) {
    result = isVesting ? 0 : vaultDepositBalance[_address];
  }

  /**
   * @notice Deposit token into Yearn Earn and Vault contracts
   * @param _amounts amount of earn and vault to deposit in list: [earn deposit amount, vault deposit amount]
   * Requirements:
   * - Sender must approve this contract to transfer token from sender to this contract
   * - This contract is not in vesting state
   * - Only Vault can call this function
   * - Either first element(earn deposit) or second element(earn deposit) in list must greater than 0
   */
  function deposit(uint256[] memory _amounts) public {
    require(!isVesting, "Contract in vesting state");
    require(msg.sender == address(daoVault), "Only can call from Vault");
    require(_amounts[0] > 0 || _amounts[1] > 0, "Amount must > 0");
    
    uint256 _earnAmount = _amounts[0];
    uint256 _vaultAmount = _amounts[1];
    uint256 _depositAmount = _earnAmount.add(_vaultAmount);
    token.safeTransferFrom(tx.origin, address(this), _depositAmount);

    uint256 _earnNetworkFee;
    uint256 _vaultNetworkFee;
    uint256 _networkFeePercentage;
    /**
     * Network fees
     * networkFeeTier2 is used to set each tier minimun and maximun
     * For example networkFeeTier2 is [50000, 100000],
     * Tier 1 = _depositAmount < 50001
     * Tier 2 = 50001 <= _depositAmount <= 100000
     * Tier 3 = _depositAmount > 100000
     *
     * networkFeePercentage is used to set each tier network fee percentage
     * For example networkFeePercentage is [100, 75, 50]
     * which mean network fee for Tier 1 = 1%, Tier 2 = 0.75%, Tier 3 = 0.5%
     *
     * customNetworkFeeTier is set before network fee tier 3
     * customNetworkFeepercentage will be used if _depositAmount over customNetworkFeeTier before network fee tier 3
     */
    if (_depositAmount < networkFeeTier2[0]) {
      // Tier 1
      _networkFeePercentage = networkFeePercentage[0];
    } else if (_depositAmount >= networkFeeTier2[0] && _depositAmount <= networkFeeTier2[1]) {
      // Tier 2
      _networkFeePercentage = networkFeePercentage[1];
    } else if (_depositAmount >= customNetworkFeeTier) {
      // Custom tier
      _networkFeePercentage = customNetworkFeePercentage;
    } else {
      // Tier 3
      _networkFeePercentage = networkFeePercentage[2];
    }

    // Deposit to Yearn Earn after fee
    if (_earnAmount > 0) {
      _earnNetworkFee = _earnAmount.mul(_networkFeePercentage).div(DENOMINATOR);
      _earnAmount = _earnAmount.sub(_earnNetworkFee);
      earn.deposit(_earnAmount);
      earnDepositBalance[tx.origin] = earnDepositBalance[tx.origin].add(_earnAmount);
    }

    // Deposit to Yearn Vault after fee
    if (_vaultAmount > 0) {
      _vaultNetworkFee = _vaultAmount.mul(_networkFeePercentage).div(DENOMINATOR);
      _vaultAmount = _vaultAmount.sub(_vaultNetworkFee);
      vault.deposit(_vaultAmount);
      vaultDepositBalance[tx.origin] = vaultDepositBalance[tx.origin].add(_vaultAmount);
    }

    // Transfer network fee to treasury and community wallet
    uint _totalNetworkFee = _earnNetworkFee.add(_vaultNetworkFee);
    token.safeTransfer(treasuryWallet, _totalNetworkFee.mul(treasuryFee).div(DENOMINATOR));
    token.safeTransfer(communityWallet, _totalNetworkFee.mul(treasuryFee).div(DENOMINATOR));

    uint256 _totalAmount = _earnAmount.add(_vaultAmount);
    uint256 _shares;
    _shares = totalSupply() == 0 ? _totalAmount : _totalAmount.mul(totalSupply()).div(pool);
    _mint(address(daoVault), _shares);
    pool = pool.add(_totalAmount);
  }

  /**
   * @notice Withdraw from Yearn Earn and Vault contracts
   * @param _shares amount of earn and vault to withdraw in list: [earn withdraw amount, vault withdraw amount]
   * Requirements:
   * - This contract is not in vesting state
   * - Only Vault can call this function
   */
  function withdraw(uint256[] memory _shares) external {
    require(!isVesting, "Contract in vesting state");
    require(msg.sender == address(daoVault), "Only can call from Vault");

    if (_shares[0] > 0) {
      _withdrawEarn(_shares[0]);
    }

    if (_shares[1] > 0) {
      _withdrawVault(_shares[1]);
    }
  }

  /**
   * @notice Withdraw from Yearn Earn contract
   * @dev Only call within function withdraw()
   * @param _shares Amount of shares to withdraw
   * Requirements:
   * - Amount input must less than or equal to sender current total amount of earn deposit in contract
   */
  function _withdrawEarn(uint256 _shares) private {
    uint256 _d = pool.mul(_shares).div(totalSupply()); // Initial Deposit Amount
    require(earnDepositBalance[tx.origin] >= _d, "Insufficient balance");
    uint256 _earnShares = (_d.mul(earn.totalSupply())).div(earn.calcPoolValueInToken()); // Find earn shares based on deposit amount 
    uint256 _r = ((earn.calcPoolValueInToken()).mul(_earnShares)).div(earn.totalSupply()); // Actual earn withdraw amount

    earn.withdraw(_earnShares);
    earnDepositBalance[tx.origin] = earnDepositBalance[tx.origin].sub(_d);
    
    _burn(address(daoVault), _shares);
    pool = pool.sub(_d);

    if (_r > _d) {
      uint256 _p = _r.sub(_d); // Profit
      uint256 _fee = _p.mul(profileSharingFeePercentage).div(DENOMINATOR);
      token.safeTransfer(tx.origin, _r.sub(_fee));
      token.safeTransfer(treasuryWallet, _fee.mul(treasuryFee).div(DENOMINATOR));
      token.safeTransfer(communityWallet, _fee.mul(communityFee).div(DENOMINATOR));
    } else {
      token.safeTransfer(tx.origin, _r);
    }
  }

  /**
   * @notice Withdraw from Yearn Vault contract
   * @dev Only call within function withdraw()
   * @param _shares Amount of shares to withdraw
   * Requirements:
   * - Amount input must less than or equal to sender current total amount of vault deposit in contract
   */
  function _withdrawVault(uint256 _shares) private {
    uint256 _d = pool.mul(_shares).div(totalSupply()); // Initial Deposit Amount
    require(vaultDepositBalance[tx.origin] >= _d, "Insufficient balance");
    uint256 _vaultShares = (_d.mul(vault.totalSupply())).div(vault.balance()); // Find vault shares based on deposit amount 
    uint256 _r = ((vault.balance()).mul(_vaultShares)).div(vault.totalSupply()); // Actual vault withdraw amount

    vault.withdraw(_vaultShares);
    vaultDepositBalance[tx.origin] = vaultDepositBalance[tx.origin].sub(_d);

    _burn(address(daoVault), _shares);
    pool = pool.sub(_d);

    if (_r > _d) {
      uint256 _p = _r.sub(_d); // Profit
      uint256 _fee = _p.mul(profileSharingFeePercentage).div(DENOMINATOR);
      token.safeTransfer(tx.origin, _r.sub(_fee));
      token.safeTransfer(treasuryWallet, _fee.mul(treasuryFee).div(DENOMINATOR));
      token.safeTransfer(communityWallet, _fee.mul(communityFee).div(DENOMINATOR));
    } else {
      token.safeTransfer(tx.origin, _r);
    }
  }

  /**
   * @notice Vesting this contract, withdraw all the token from Yearn contracts
   * @notice Disabled the deposit and withdraw functions for public, only allowed users to do refund from this contract
   * Requirements:
   * - Only owner of this contract can call this function
   * - This contract is not in vesting state
   */
  function vesting() external onlyOwner {
    require(!isVesting, "Already in vesting state");

    // Withdraw all funds from Yearn Earn and Vault contracts
    isVesting = true;
    uint256 _earnBalance = earn.balanceOf(address(this));
    uint256 _vaultBalance = vault.balanceOf(address(this));
    if (_earnBalance > 0) {
      earn.withdraw(_earnBalance);
    }
    if (_vaultBalance > 0) {
      vault.withdraw(_vaultBalance);
    }

    // Collect all profits
    uint256 balance_ = token.balanceOf(address(this));
    if (balance_ > pool) {
      uint256 _profit = balance_.sub(pool);
      uint256 _fee = _profit.mul(profileSharingFeePercentage).div(DENOMINATOR);
      token.safeTransfer(treasuryWallet, _fee.mul(treasuryFee).div(DENOMINATOR));
      token.safeTransfer(communityWallet, _fee.mul(communityFee).div(DENOMINATOR));
    }
    pool = 0;
  }

  /**
   * @notice Get token amount based on daoToken hold by account after contract in vesting state
   * @param _address Address of account to check
   * @return Token amount based on on daoToken hold by account. 0 if contract is not in vesting state
   */
  function getSharesValue(address _address) external view returns (uint256) {
    if (!isVesting) {
      return 0;
    } else {
      uint256 _shares = daoVault.balanceOf(_address);
      if (_shares > 0) {
        return token.balanceOf(address(this)).mul(_shares).div(daoVault.totalSupply());
      } else {
        return 0;
      }
    }
  }

  /**
   * @notice Refund all tokens based on daoToken hold by sender
   * @notice Only available after contract in vesting state
   * Requirements:
   * - This contract is in vesting state
   * - Only Vault can call this function
   */
  function refund(uint256 _shares) external {
    require(isVesting, "Not in vesting state");
    require(msg.sender == address(daoVault), "Only can call from Vault");

    uint256 _refundAmount = token.balanceOf(address(this)).mul(_shares).div(daoVault.totalSupply());
    token.safeTransfer(tx.origin, _refundAmount);
    _burn(address(daoVault), _shares);
  }

  /**
   * @notice Approve Vault to migrate funds from this contract
   * @notice Only available after contract in vesting state
   * Requirements:
   * - Only owner of this contract can call this function
   * - This contract is in vesting state
   */
  function approveMigrate() external onlyOwner {
    require(isVesting, "Not in vesting state");

    if (token.allowance(address(this), address(daoVault)) == 0) {
      token.safeApprove(address(daoVault), MAX_UNIT);
    }
  }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../../utils/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.4.22 <0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IYearn is IERC20 {
  function calcPoolValueInToken() external view returns (uint256);
  function deposit(uint256 _amount) external;
  function withdraw(uint256 _shares) external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.4.22 <0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IYvault is IERC20 {
  function balance() external view returns (uint256);
  function deposit(uint256 _amount) external;
  function withdraw(uint256 _shares) external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

interface IDaoVault {
  function totalSupply() external view returns (uint256);
  function balanceOf(address _address) external view returns (uint256); 
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000dac17f958d2ee523a2206206994597c13d831ec7000000000000000000000000e6354ed5bc4b393a5aad09f21c46e101e692d4470000000000000000000000002f08119c6f07c006695e079aafc638b8789faf18

-----Decoded View---------------
Arg [0] : _token (address): 0xdAC17F958D2ee523a2206206994597C13D831ec7
Arg [1] : _earn (address): 0xE6354ed5bC4b393a5Aad09f21c46E101e692d447
Arg [2] : _vault (address): 0x2f08119C6f07c006695E079AAFc638b8789FAf18

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000dac17f958d2ee523a2206206994597c13d831ec7
Arg [1] : 000000000000000000000000e6354ed5bc4b393a5aad09f21c46e101e692d447
Arg [2] : 0000000000000000000000002f08119c6f07c006695e079aafc638b8789faf18