input: Write a function to extract the non-vowel words from a given sentence. The function should return a list of words that do not contain any vowel characters. If the input sentence is empty, the function should return an empty list.
  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', 'the', 'lazy', 'dog']
  assert extract_words("Python is a great language.")==['Python', 'is']
  assert extract_words("JavaScript is widely used.")==['is', 'widely', 'used']
  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)]