pragma solidity ^0.4.25;
contract MultiVACToken {
    string public name = "MultiVAC";      //  token name
    string public symbol = "MTV";           //  token symbol
    uint256 public decimals = 18;            //  token digit
    mapping (address => uint256) public balanceOf;
    mapping (address => mapping (address => uint256)) public allowance;
    uint256 public totalSupply = 0;
    bool public stopped = false;
    uint256 constant initSupply = 10**10;
    address owner = address(0);
    modifier isOwner {
        require(owner == msg.sender);
        _;
    }
    modifier isRunning {
        require(!stopped);
        _;
    }
    modifier validAddress {
        require(address(0) != msg.sender);
        _;
    }
    constructor() public {
        owner = msg.sender;
        totalSupply = initSupply * (10 ** decimals);
        balanceOf[msg.sender] = totalSupply;
        emit Transfer(address(0), msg.sender, totalSupply);
    }
    function transfer(address _to, uint256 _value) public isRunning validAddress returns (bool success) {
        require(_to != address(0));
        require(balanceOf[msg.sender] >= _value);
        require(balanceOf[_to] + _value >= balanceOf[_to]);
        balanceOf[msg.sender] -= _value;
        balanceOf[_to] += _value;
        emit Transfer(msg.sender, _to, _value);
        return true;
    }
    function transferFrom(address _from, address _to, uint256 _value) public isRunning validAddress returns (bool success) {
        require(_to != address(0));
        require(balanceOf[_from] >= _value);
        require(balanceOf[_to] + _value >= balanceOf[_to]);
        require(allowance[_from][msg.sender] >= _value);
        balanceOf[_to] += _value;
        balanceOf[_from] -= _value;
        allowance[_from][msg.sender] -= _value;
        emit Transfer(_from, _to, _value);
        return true;
    }
    function approve(address _spender, uint256 _value) public isRunning validAddress returns (bool success) {
        require(_value == 0 || allowance[msg.sender][_spender] == 0);
        allowance[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }
    function stop() public isOwner {
        stopped = true;
    }
    function start() public isOwner {
        stopped = false;
    }
    function setName(string _name) public isOwner {
        name = _name;
    }
    function burn(uint256 _value) public isRunning {
        require(balanceOf[msg.sender] >= _value);
        balanceOf[msg.sender] -= _value;
        balanceOf[address(0)] += _value;
        emit Transfer(msg.sender, address(0), _value);
    }
    function () public payable{ 
        revert(); 
    }
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}