Fallback and self destruct Solidity example.

FallbackAndSelfDestructExample.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";

contract FallbackAndSelfDestructExample is Ownable {

    function destroy(address _addr) external onlyOwner {
        address payable addr = payable(address(_addr));
        selfdestruct(addr);
    }

    // This fallback function 
    // will keep all the Ether
    receive() external payable {
    }
}