gistfile1.rb

class Car
  attr_accessor :engine

  def	initialize(engine)
    @engine = engine
  end

  def start_engine
    @engine.start
  end

  def	stop_engine
    @engine.stop
  end
end

class Car
  attr_accessor :engine
  delegate :start, :stop, :to => :engine

  def	initialize(engine)
    @engine = engine
  end
end

class Engine
  def start
  end
  
  def stop
  end
end