How to use the normality.cleaning.compose_nfc function in normality

def sanitize_text(text, encoding=DEFAULT_ENCODING):
    text = stringify(text, encoding_default=encoding)
    if text is not None:
        try:
            text = compose_nfc(text)
        except (SystemError, Exception) as ex:
            log.warning("Cannot NFC text: %s", ex)
            return None
        text = remove_unsafe_chars(text)
        text = text.encode(DEFAULT_ENCODING, "replace")
        return text.decode(DEFAULT_ENCODING, "replace")