DO NOT USE THIS CODE. THIS CODE IS USED TO DEMONSTRATE A VULNERABILITY IN A SOLIDITY CODE.

HashForEther.sol

contract HashForEther {
    
    function withdrawWinnings() {
        // Winner if the last 8 hex characters of the address are 0. 
        require(uint32(msg.sender) == 0);
        _sendWinnings();
     }
     
     function _sendWinnings() {
         msg.sender.transfer(this.balance);
     }
}