input: Write a python function to create an instance of a Person class and return the full name.
  assert create_person("John", "Doe") == "John Doe"
  assert create_person("Jane", "Smith") == "Jane Smith"
  assert create_person("Emily", "Clark") == "Emily Clark"
output: class Person:
      def __init__(self, first_name, last_name):
          self.first_name = first_name
          self.last_name = last_name
      
      def full_name(self):
          return f"{self.first_name} {self.last_name}"
  
  def create_person(first_name, last_name):
      person = Person(first_name, last_name)
      return person.full_name()