input: Write a python function to extract words from a sentence that do not contain any vowels.
  assert extract_words("This is an example sentence") == ['Ths', 'sntnc']
  assert extract_words("Hello World") == ['Wrld']
  assert extract_words("Python programming") == ['Pythn']
output: def extract_words(sentence):
      vowels = "aeiouAEIOU"
      words = sentence.split()
      result = []
      for word in words:
          if all(char not in vowels for char in word):
              result.append(word)
      return result