input: Write a function to extract the non-vowel words from a given sentence. The function should split the sentence into words, check each word for the presence of vowels, and return a list of words that do not contain any vowels.
  assert extract_words("This machine learning project is challenging.") == ['This', 'machine', 'learning', 'project', 'is', 'challenging']
  assert extract_words("The quick brown fox jumps over the lazy dog") == ['The', 'quick', 'brown', 'fox', 'jumps', 'over', 'the', 'lazy', 'dog']
  assert extract_words("A test sentence with no non-vowel words") == ['with', 'no']
  assert extract_words(" ") == []
  assert extract_words("") == []
output: def extract_words(sentence):
      vowels = "aeiouAEIOU"
      words = sentence.split()
      return [word for word in words if all(char not in vowels for char in word)]