input: Write a python function to create a Person class with methods to retrieve full name and age, and validate with assert statements.
  assert person.get_full_name() == "John Doe"
  assert person.age == 25
output: def create_person():
      class Person:
          def __init__(self, first_name, last_name, age):
              self.first_name = first_name
              self.last_name = last_name
              self.age = age
  
          def get_full_name(self):
              return f"{self.first_name} {self.last_name}"
  
      person = Person("John", "Doe", 25)
      assert person.get_full_name() == "John Doe"
      assert person.age == 25
  
      return person