def force_decode(string:bytes) ->str:
    """
    sometimes neither gbk nor gbk can decode succseefully from string
    select longger decode result from utf8 or gbk
    """
    if not isinstance(string, bytes):
        raise ValueError('expected bytes array')
    decode_chars_count = []
    for i in ['utf8', 'gbk']:
        try:
            return string.decode(i)
        except UnicodeDecodeError as ex:
            decode_chars_count.append(ex.start)
    # neither utf8 or gbk decode successfully
    # select the longer decode one
    utf8_len, gbk_len = decode_chars_count
    selected_encoding = 'utf8' if utf8_len > gbk_len else 'gbk'
    return string.decode(selected_encoding, errors='ignore')