input: 
  def extract_words(sentence: str) -> list:
      """Extracts and returns a list of words that do not contain any vowels.
      >>> extract_words("This machine learning project is challenging.")
      ['This', 'machine', 'learning', 'project', 'is', 'challenging.']
      >>> extract_words("My name is John Doe.")
      ['My', 'name', 'is', 'John', 'Doe.']
      """
  
output:     words = sentence.split()
      vowels = "aeiouAEIOU"
      result = [word for word in words if all(char not in vowels for char in word)]
      return result