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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def remove_too_short(utterances: List[Utterance], _winlen=25, winstep=10) -> List[Utterance]: """ Removes utterances that will probably have issues with CTC because of the number of frames being less than the number of tokens in the transcription. Assuming char tokenization to minimize false negatives. """

    def is_too_short(utterance: Utterance) -> bool:
        charlen = len(utterance.text)
        if (duration(utterance) / winstep) < charlen:
            return True
        else:
            return False

    return [utter for utter in utterances if not is_too_short(utter)]