PiggyBank.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.4.22 <0.8.0;

contract PiggyBank {
    uint public goal;
    
    constructor(uint _goal) {
        goal = _goal;
    }
    
    receive() external payable {}
    
    function getMyBalance() public view returns (uint) {
        return address(this).balance;
    }
    
    function withdraw() public {
        if (getMyBalance() > goal) {
            selfdestruct(msg.sender);
        }
    }
}