ElementalBrian

import "./Ownable.sol";
pragma solidity 0.5.12;

contract Destroyable is Ownable{
    function close() public onlyOwner { //onlyOwner is custom modifier
    address payable ownerpayable = address(uint160(owner));
        selfdestruct(ownerpayable);  // `owner` is the owners address
    }    
}

ElementalBrian

import "./Ownable.sol";
pragma solidity 0.5.12;

contract Destroyable is Ownable{
    function close() public onlyOwner { //onlyOwner is custom modifier
    address payable ownerpayable = address(uint160(owner));
        selfdestruct(ownerpayable);  // `owner` is the owners address
    }    
}

ElementalBrian

import "./Ownable.sol";
pragma solidity 0.5.12;

contract Destroyable is Ownable{
    function close() public onlyOwner { //onlyOwner is custom modifier
    address payable ownerpayable = address(uint160(owner));
        selfdestruct(ownerpayable);  // `owner` is the owners address
    }    
}

ElementalBrian

import "./Ownable.sol";
pragma solidity 0.5.12;

contract Destroyable is Ownable{
    function close() public onlyOwner { //onlyOwner is custom modifier
    address payable ownerpayable = address(uint160(owner));
        selfdestruct(ownerpayable);  // `owner` is the owners address
    }    
}

ElementalBrian

pragma solidity 0.5.12;

contract Destroyable{
    
}