input: def extract_words(sentence: str) -> List[str]:
      """Extract and return a list of words from the given sentence that do not contain any vowels.
      >>> extract_words("This machine learning project is challenging.")
      ['machine', 'learning', 'project', 'is', 'challenging.']
      >>> extract_words("Python is a great language for programming.")
      ['Python', 'is', 'a', 'grt', 'lng', 'fr', 'prgrmmng.']
      """
output:     vowels = "aeiouAEIOU"
      words = sentence.split()
      result = []
      for word in words:
          if not any(char in vowels for char in word):
              result.append(word)
      return result