input: Write a function to create an autocomplete system that predicts words based on the input text. The function should generate the word candidates, filter them, rank them, and return the top 5 suggestions. 
  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("hello")==["hellos", "helloed", "helloing", "hellow", "hellobox"]
  assert autocomplete("run")==["running", "runner", "runs", "runt", "runaway"]
  assert autocomplete("javascript")==["javascripts", "javascripting", "javascripted", "javascripting", "javasamples"]
  assert autocomplete("python")==["pythonic", "pythoned", "pythoning", "pythons", "pythonist"]
  assert autocomplete("code")==["codes", "coded", "coding", "coder", "codex"]
output: def autocomplete(input_text):
      word_candidates = generate_candidates(input_text)
      filtered_words = filter_candidates(word_candidates)
      sorted_words = rank_words(filtered_words)
      return sorted_words[:5]