input: Write a function to implement 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.
  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("ba") == ["bake", "banana", "band", "bar", "ball"]
  assert autocomplete("ca") == ["cake", "car", "cat", "case", "call"]
  assert autocomplete("da") == ["dance", "dark", "date", "dad", "day"]
  assert autocomplete("el") == ["elephant", "element", "else", "elbow", "elevate"]
  assert autocomplete("fo") == ["for", "four", "fox", "form", "forward"]
output: def autocomplete(input_text):
      word_candidates = ["bake", "banana", "band", "bar", "ball", "cake", "car", "cat", "case", "call", "dance", "dark", "date", "dad", "day", "elephant", "element", "else", "elbow", "elevate", "for", "four", "fox", "form", "forward"]
      filtered_words = [word for word in word_candidates if word.startswith(input_text)]
      sorted_words = sorted(filtered_words)
      return sorted_words[:5]