def quiz_blank_in_pos(word, quiz_blank):
    """Checks if a word in quiz_blank is a substring of the word passed in.

    Args:
        word: A string representing the word to be checked.
        quiz_blank: A string representing the missing word placeholders.

    Returns:
        The quiz_blank if found and None if not found.
    """

    if quiz_blank in word:
        return quiz_blank
    return None