input: Write a python function to create a ChildClass object that inherits from ParentClass and overrides the message attribute.
  assert create_child_object().message == 'Hello, Child'
  assert isinstance(create_child_object(), ParentClass)
output: class ParentClass:
      message = 'Hello, Parent'
  
  class ChildClass(ParentClass):
      message = 'Hello, Child'
  
  def create_child_object():
      return ChildClass()