correct_liskov_principle.rb

class Animal
  def talk
    ''
  end
end

class Dog < Animal
  def talk
    'bork'
  end
end

class Cat < Animal
  def talk
    'meow'
  end
end

def animal_info(animal)
   "This is #{animal.class.name} and it says #{animal.talk.upcase}"
end

animal_info(Dog.new)
animal_info(Cat.new)