Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.6.12+commit.27d51765.js&optimize=false&runs=200&gist=

SmartContract.sol

pragma solidity ^0.6.0;
import "https://github.com/OpenZeppelin/openzeppelin-contracts/contracts/access/Ownable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/contracts/math/SafeMath.sol";
import "./Allowance.sol";


contract SharedWallet is Ownable, Allowance {

    event MoneySent(address indexed _beneficiary, uint _amount); 
    event MoneyReceived(address indexed _from, uint _amount);
    function withdrawMoney(address payable _to, uint _amount) public ownerOrAllowed(_amount) {
        require(_amount <= address(this).balance, "Contract doesn't own enough money"); 
        if(!isOwner()) {
            reduceAllowance(msg.sender, _amount); 
        }
        emit MoneySent(_to, _amount);
        _to.transfer(_amount); 
    }

    function renounceOwnership() public override onlyOwner {
        revert("can't renounceOwnership here"); //not possible with this smart contract
    }
    receive() external payable {
        emit MoneyReceived(msg.sender, msg.value);
    }}