function timeOutBySender(uint _transactionID) public {
        Transaction storage transaction = transactions[_transactionID];

        require(transaction.status == Status.WaitingReceiver, "The transaction is not waiting on the receiver.");
        require(now - transaction.lastInteraction >= feeTimeout, "Timeout time has not passed yet.");

        executeRuling(_transactionID, SENDER_WINS);
    }