input: Write a function to extract the non-vowel words in a sentence. If there are no non-vowel words, return an empty list.
  assert extract_words("This machine learning project is challenging.")==['machine', 'learning', 'project', 'is', 'challenging.']
  assert extract_words("All vowels aeio.")==[]
  assert extract_words("bcd fgh jkl mnp qrs tvw xyz")==['bcd', 'fgh', 'jkl', 'mnp', 'qrs', 'tvw', 'xyz']
  assert extract_words("")==[]
output: def extract_words(sentence):
      vowels = "aeiouAEIOU"
      return [word for word in sentence.split() if not any(char in vowels for char in word)]