How to use the ytmdl.stringutils.remove_unwanted_chars function in ytmdl

def dw(value, proxy=None, song_name='ytmdl_temp.mp3'):
    """Download the song."""
    try:
        # Get the audio stream link
        url = get_audio_URL(value, proxy)
        logger.debug("Audio URL is: {}".format(url))
        logger.hold()

        # If song_name doesn't have mp3 extension, add it
        if not song_name.endswith('.mp3'):
            song_name += '.mp3'

        # Replace the spaces with hashes
        song_name = stringutils.remove_unwanted_chars(song_name)

        # The directory where we will download to.
        dw_dir = defaults.DEFAULT.SONG_TEMP_DIR
        logger.info("Saving the files to: {}".format(dw_dir))

        if not os.path.exists(dw_dir):
            os.makedirs(dw_dir)

        # Name of the temp file
        name = os.path.join(dw_dir, song_name)

        # Start downloading the song
        status = Download(url, name).download()

        if status:
            return name

def dw(value, proxy=None, song_name='ytmdl_temp.mp3'):
    """Download the song."""
    try:
        # Get the audio stream link
        url = get_audio_URL(value, proxy)
        logger.debug("Audio URL is: {}".format(url))
        logger.hold()

        # If song_name doesn't have mp3 extension, add it
        if not song_name.endswith('.mp3'):
            song_name += '.mp3'

        # Replace the spaces with hashes
        song_name = stringutils.remove_unwanted_chars(song_name)

        # The directory where we will download to.
        dw_dir = defaults.DEFAULT.SONG_TEMP_DIR
        logger.info("Saving the files to: {}".format(dw_dir))

        if not os.path.exists(dw_dir):
            os.makedirs(dw_dir)

        # Name of the temp file
        name = os.path.join(dw_dir, song_name)

        # Start downloading the song
        status = Download(url, name).download()

        if status:
            return name