input: Write a function to extract the non-vowel words from a given sentence. Return a list of words that do not contain any vowels. If the sentence is empty, return an empty list.
  assert extract_words("This machine learning project is challenging.") == ["This", "machine", "project", "is", "challenging."]
  assert extract_words("Python is amazing") == ["Python", "is", "amazing"]
  assert extract_words("The quick brown fox jumps over the lazy dog") == ["The", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"]
  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)]