input: Write a function to extract the non-vowel words in a given sentence. If the given sentence is empty then return an empty list.
  assert extract_words("This machine learning project is challenging")==['machine', 'learning', 'project', 'is', 'challenging']
  assert extract_words("Python is fun")==['Python', 'fun']
  assert extract_words("AEIOU aeiou")==[]
  assert extract_words("")==[]
output: def extract_words(sentence):
      vowels = "aeiouAEIOU"
      if not sentence:
          return []
      words = sentence.split()
      return [word for word in words if not any(char in vowels for char in word)]