input: Write a python function to create a Person object and return its string representation.
  assert create_person('Alice', 30, 'Female', 'American') == 'Name: Alice\nAge: 30\nGender: Female\nNationality: American'
  assert create_person('Bob', 25, 'Male', 'British') == 'Name: Bob\nAge: 25\nGender: Male\nNationality: British'
  assert create_person('Eve', 40, 'Female', 'Canadian') == 'Name: Eve\nAge: 40\nGender: Female\nNationality: Canadian'
output: def create_person(name, age, gender, nationality):
      class Person:
          def __init__(self, name, age, gender, nationality):
              self.name = name
              self.age = age
              self.gender = gender
              self.nationality = nationality
          
          def __str__(self):
              return f"Name: {self.name}\nAge: {self.age}\nGender: {self.gender}\nNationality: {self.nationality}"
      
      person = Person(name, age, gender, nationality)
      return str(person)