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-v0.8.13+commit.abaa5c0e.js&optimize=false&runs=200&gist=

contracts...SimpleSplitter.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

contract SimpleSplitter {

    event Received(address, uint256);
    error PaymentFailed();
    error WrongShares();
    error WrongAddress();

    address private immutable _addr1;
    address private immutable _addr2;

    uint256 private immutable _share1;
    uint256 private immutable _share2;

    constructor(address addr1_, address addr2_, uint256 share1_, uint256 share2_) {
        if (addr1_ == address(0) || addr2_ == address(0)) revert WrongAddress();
        if (share1_ + share2_ != 100) revert WrongShares();
        if (share1_ == 0 || share2_ == 0) revert WrongShares();

        _addr1 = addr1_;
        _addr2 = addr2_;

        _share1 = share1_;
        _share2 = share2_;
    }

    receive() external payable {
        emit Received(msg.sender, msg.value);
    }

    function withdraw() external {
        uint256 balance = address(this).balance;

        (bool success1, ) = _addr1.call{value: balance * _share1 / 100 }("");
        (bool success2, ) = _addr2.call{value: balance * _share2 / 100 }("");

        if (!success1 && !success2) revert PaymentFailed();
    }

}