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.
  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("Python is a great language.")==['Python', 'is', 'a', 'great', 'language']
  assert extract_words("Twinkle twinkle little star.")==['Twinkle', 'twinkle', 'little', 'star']
  assert extract_words("")==[]
output: def extract_words(sentence):
      vowels = "aeiouAEIOU"
      return [word for word in sentence.split() if all(char not in vowels for char in word)]