Forward ether to multiple addresses

Question

How can I write a contract that sends some of the ether it receives on to one wallet, and the rest of the ether back to the sender (or another wallet)

The following code works if I comment out either line 17 or 18 but doesn't when both are uncommented:

pragma solidity ^0.4.24;

contract Forwarder {

    address public destinationAddress;
    address constant public otherAddress = 0xf17f52151EbEF6C7334FAD080c5704D77216b732;

    event LogForwarded(address indexed sender, uint amount);
    event LogFlushed(address indexed sender, uint amount);

    function Forwarder() public {
        destinationAddress = msg.sender;
    }

    function() payable public {
        emit LogForwarded(msg.sender, msg.value);
        otherAddress.transfer(msg.value /3);        // 17
        destinationAddress.transfer(msg.value /3);  // 18
    }

    function flush() public {
        emit LogFlushed(msg.sender, address(this).balance);
        destinationAddress.transfer(address(this).balance);
    }

}

Answer 1

Take note that the default Gas Limit for fallback function is very small then may not enough gas to pay fee for 2 or more internal transfer transactions. You should increase Gas Limit when sending ETH to the smart contract.