```ruby
class AnswerSilence

  def self.handles?(input)
    input.empty?
  end

  def reply
    'Fine. Be that way.'
  end

end

class AnswerQuestion

  def self.handles?(input)
    input.include?('?')
  end

  def reply
    'Sure.'
  end

end

class AnswerShout

  def self.handles?(input)
    input == input.upcase
  end

  def reply
    'Woah, chill out!'
  end

end

class AnswerDefault

  def self.handles?(input)
    true
  end

  def reply
    'Whatever.'
  end

end

class Alice

  def hey(input)
    answerer(input).reply
  end

  private

  def answerer(input)
    handlers.find {|answer| answer.handles?(input)}.new
  end

  def handlers
    [AnswerSilence, AnswerQuestion, AnswerShout, AnswerDefault]
  end

end

class Bob

  def hey(something)
    if silent?(something)
      'Fine. Be that way.'
    elsif question?(something)
      'Sure.'
    elsif shouting?(something)
      'Woah, chill out!'
    else
      'Whatever.'
    end
  end

  private

  def question?(s)
    s.end_with?('?')
  end

  def silent?(s)
    s.empty?
  end

  def shouting?(s)
    s.upcase == s
  end

end

```

Fix implementation of question in ruby:bob
user
```ruby
class AnswerSilence

  def self.handles?(input)
    input.empty?
  end

  def reply
    'Fine. Be that way.'
  end

end

class AnswerQuestion

  def self.handles?(input)
    input.end_with?('?')
  end

  def reply
    'Sure.'
  end

end

class AnswerShout

  def self.handles?(input)
    input == input.upcase
  end

  def reply
    'Woah, chill out!'
  end

end

class AnswerDefault

  def self.handles?(input)
    true
  end

  def reply
    'Whatever.'
  end

end

class Alice

  def hey(input)
    answerer(input).reply
  end

  private

  def answerer(input)
    handlers.find {|answer| answer.handles?(input)}.new
  end

  def handlers
    [AnswerSilence, AnswerQuestion, AnswerShout, AnswerDefault]
  end

end

class Bob

  def hey(something)
    if silent?(something)
      'Fine. Be that way.'
    elsif question?(something)
      'Sure.'
    elsif shouting?(something)
      'Woah, chill out!'
    else
      'Whatever.'
    end
  end

  private

  def question?(s)
    s.end_with?('?')
  end

  def silent?(s)
    s.empty?
  end

  def shouting?(s)
    s.upcase == s
  end

end

```
assistant