def get_id(first_name, last_name):
    """
    :param first_name: The first_name to search for.
    :param last_name: The last_name to search for.
    :return: The id number for the given first/last name, otherwise None.
    """
    with open("database.txt", "r") as file:
        for line in file:
            line = line.rstrip()
            if not line:
                continue
            first, last, _id = line.split(", ")
            if first_name == first and last_name == last:
                return _id
    return None