input: Write a python function to create a subclass of Animal that represents a Dog and overrides the make_sound method to print "The dog barks."
  assert isinstance(Dog(), Animal)
  assert Dog().make_sound() == "The dog barks."
output: def create_dog_class():
      class Animal:
          def make_sound(self):
              raise NotImplementedError("Subclasses must implement this method")
      
      class Dog(Animal):
          def make_sound(self):
              return "The dog barks"
      
      return Dog