contract IERC223 {
    /* IERC20 */
    function approve(address spender, uint256 value) public returns (bool);
    function transferFrom(address from, address to, uint256 value) public returns (bool);
    function totalSupply() public view returns (uint256);
    function balanceOf(address who) public view returns (uint256);
    function allowance(address owner, address spender) public view returns (uint256);
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed _from, address indexed _to, uint256 _value);

    /* IERC223 */
    function transfer(address to, uint256 value) public returns (bool);
    function transfer(address to, uint256 value, bytes memory data) public returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value, bytes data);
}
function approve(address spender, uint256 value) public returns (bool);
/* IERC20 */