def filter_text(text, filters):
    """Run `text` through a series of filters.

    `filters` is a list of functions. Each takes a string and returns a
    string.  Each is run in turn.

    Returns: the final string that results after all of the filters have
    run.

    """
    clean_text = text.rstrip()
    ending = text[len(clean_text):]
    text = clean_text
    for fn in filters:
        lines = []
        for line in text.splitlines():
            lines.extend(fn(line).splitlines())
        text = "\n".join(lines)
    return text + ending