def to_utf(line):
    """Converts a bytecode string to unicode. Ignores lines that have unicode
    decode errors.
    Args:
        line (string) a single line in the file
    Returns:
        a single line that's been cleaned
    """
    utf_line = ''
    try:
        utf_line = str(line, 'utf8')
        return utf_line
    except UnicodeDecodeError as u:
        # print(u)
        return None