src/transformers/models/whisper/english_normalizer.py/EnglishNumberNormalizer/__call__
class EnglishNumberNormalizer:    def __call__(self, s: str):
        s = self.preprocess(s)
        s = " ".join(word for word in self.process_words(s.split()) if word is not None)
        s = self.postprocess(s)

        return s