code: def word
        letter_count = weighted(:count, :letter).to_i
        if letter_count == 1
          last_letter! nil
        elsif letter_count > 0
          result = first_letter
          (letter_count - 2).times { result += next_letter!(result[-1]) }
          result + last_letter!(result[-1])
        end
      end
docs: Generate word
  
   @return [String]