def hint(topic)
      cheatsheet = cheatsheet_for_topic(topic)

      if cheatsheet
        print_cheatsheet(cheatsheet)
      else
        display_missing_cheatsheet_error(topic)
      end
    end
def hint(topic)
      cheatsheet = cheatsheet_for_topic(topic)

      if cheatsheet
        print_cheatsheet(cheatsheet)
      else
        display_missing_cheatsheet_error(topic)
      end
    end
creates a new {Hinter} instance

 searches and prints a cheatsheet for a given topic
 to the console

 if no cheatsheet is found for the given topic
 a error message will be printed to the console

 @param topic [String]