input: Write a python function to create a StudentRecord instance and verify its properties using assert statements.
  assert isinstance(create_student('John', 'Doe', 20), StudentRecord)
  assert create_student('John', 'Doe', 20).first_name == 'John'
  assert create_student('John', 'Doe', 20).last_name == 'Doe'
  assert create_student('John', 'Doe', 20).age == 20
output: class StudentRecord:
      def __init__(self, first_name, last_name, age):
          self.first_name = first_name
          self.last_name = last_name
          self.age = age
  
  def create_student(first_name, last_name, age):
      return StudentRecord(first_name, last_name, age)