self.rb

class Chief
  attr_reader :name, :restaurant
  def initialize(name, age, restaurant)
    @name = name
    @age = age
    @restaurant = restaurant
  end
end

class Restaurant

  attr_reader :name, :chief
  def initialize(name, city, chief_name, chief_age)
    @name, @city = name, city
    @chief = Chief.new(chief_name, chief_age, self)
  end

  def to_s
    return "Welcome to #{@name}, in #{@city}"
  end
end

mama = Restaurant.new("Mama Roma", "Paris", "Georges", 51)
georges = mama.chief
puts georges.restaurant