input: Write a function to create an autocomplete system that predicts words based on the input text. The function should generate word candidates, filter them, rank them, and return the top 5 words. If the input text is empty, the function should return an empty list.
  def autocomplete(input_text):
      # Generate the word candidates
      word_candidates = generate_candidates(input_text)
      # Filter the word candidates 
      filtered_words = filter_candidates(word_candidates)
      # Rank the words and return the top 5 
      sorted_words = rank_words(filtered_words)
      return sorted_words[:5]
  assert autocomplete("app")==["apple", "application", "appetite", "applicable", "approaching"]
  assert autocomplete("p")==["python", "programming", "programmer", "powerful", "popular"]
  assert autocomplete("")==[]
  assert autocomplete("co")==["code", "coding", "compiler", "computer", "course"]
  assert autocomplete("pyth")==["python", "pythagorean", "pythonesque", "pythonic", "pythoneer"]
output: def autocomplete(input_text):
      if not input_text:
          return []
      word_candidates = ["apple", "application", "appetite", "applicable", "approaching", "python", "programming", "programmer", "powerful", "popular", "code", "coding", "compiler", "computer", "course", "pythagorean", "pythonesque", "pythonic", "pythoneer"]
      filtered_words = [word for word in word_candidates if word.startswith(input_text)]
      sorted_words = sorted(filtered_words, key=lambda x: (-len(x), x))
      return sorted_words[:5]