// Vulnerability label: locked
/**
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 */

/**
 * Created on 2018-08-16 03:50
 * @summary
 * Don't let 'em say you ain't beautiful.
 * They can all get fucked.
 * Just stay true to you.
 * @author yong
 */
pragma solidity ^0.4.23;


library SafeMath {

    function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
        if (a == 0) {
            return 0;
        }

        c = a * b;
        assert(c / a == b);
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
        c = a + b;
        assert(c >= a);
        return c;
    }
}

contract Ownable {
  address public owner;


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

  constructor() public {
    owner = msg.sender;
  }

  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(owner);
    owner = address(0);
  }

  function transferOwnership(address _newOwner) public onlyOwner {
    _transferOwnership(_newOwner);
  }

  function _transferOwnership(address _newOwner) internal {
    require(_newOwner != address(0));
    emit OwnershipTransferred(owner, _newOwner);
    owner = _newOwner;
  }

}

contract ERC20 is Ownable {

    using SafeMath for uint256;

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    mapping(address => uint256) balances;
    mapping (address => mapping (address => uint256)) internal allowed;

    uint256 totalSupply_;

    function ()
        public
        payable {
    }

    function totalSupply() public view returns (uint256) {
        return totalSupply_;
    }

    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);
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

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

    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]);

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

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

    function allowance(
        address _owner,
        address _spender
     )
        public
        view
        returns (uint256)
    {
        return allowed[_owner][_spender];
    }

    function increaseApproval(
        address _spender,
        uint _addedValue
    )
        public
        returns (bool)
    {
        allowed[msg.sender][_spender] = (
            allowed[msg.sender][_spender].add(_addedValue));
        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }

    function decreaseApproval(
        address _spender,
        uint _subtractedValue
    )
        public
        returns (bool)
    {
        uint oldValue = allowed[msg.sender][_spender];
        if (_subtractedValue > oldValue) {
            allowed[msg.sender][_spender] = 0;
        } else {
            allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
        }
        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }

    function withdraw()
        public
        onlyOwner {
        msg.sender.transfer(address(this).balance);
    }

}


contract ERC223ReceivingContract { 
    function tokenFallback(address _from, uint _value, bytes _data) public;
}


contract ERC223 is ERC20 {

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

        bytes memory empty;
        uint256 codeLength;

        assembly {
            codeLength := extcodesize(_to)
        }

        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        if(codeLength > 0) {
            ERC223ReceivingContract receiver = ERC223ReceivingContract(_to);
            receiver.tokenFallback(msg.sender, _value, empty);
        }
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    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]);

        bytes memory empty;
        uint256 codeLength;

        assembly {
            codeLength := extcodesize(_to)
        }

        balances[_from] = balances[_from].sub(_value);

        if(codeLength > 0) {
            ERC223ReceivingContract receiver = ERC223ReceivingContract(_to);
            receiver.tokenFallback(msg.sender, _value, empty);
        }

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

}


/**
 * ââââââ¦ââââââââââââââââââââââââ¦âââââââââââ
 * âââââââââââââââââââââââââââââââââââââââââ
 * ââââââ©âââââââââââââ¦âââ¦ââââââââ£âââ£âââââ¦âââ
 * ââââââââââââââââ£âââââââââ£âââââ£âââââââââââ£
 * âââââââââââââââââââ âââ£âââ£ââââââââââ£ââââââ£
 * ââââââââââââââââ©ââââââââââââââ©âââ©ââ©âââ©âââ
 */
contract Chloe is ERC223 {

    string public constant name = "Shuhan Liao";
    string public constant symbol = "Chloe";
    uint8 public constant decimals = 0;
    string public message;

    /* constructor */
    constructor()
        public {

        totalSupply_ = 2;
        balances[owner] = totalSupply_;
        emit Transfer(0x0, owner, totalSupply_);

        message = "Happy Valentines Day!";
    }
}