def convert_csv(csv_white, csv_comma=""):
    """Convert white-space-delimited CSV to comma-delimited CSV.

    Args:
        csv_white: Original CSV file with white space as the delimiter.
        csv_comma: New CSV file with comma as the delimiter. Default
            use the same prefix as the original CSV.
    """
    if not csv_comma:
        csv_comma = csv_white[:-4] + ".csv"
    with open(csv_white, "r") as f_white:
        with open(csv_comma, "w") as f_comma:
            for line in f_white:
                f_comma.write(",".join(line.split()))
                f_comma.write("\n")
    return None