input: Write a python function to create a CollegeStudent object and retrieve its attributes.
  assert student.get_name() == 'John'
  assert student.get_age() == 21
  assert student.get_major() == 'Computer Science'
output: class CollegeStudent:
      def __init__(self, name, age, major):
          self.name = name
          self.age = age
          self.major = major
  
      def get_name(self):
          return self.name
  
      def get_age(self):
          return self.age
  
      def get_major(self):
          return self.major
  
  def create_student():
      student = CollegeStudent('John', 21, 'Computer Science')
      return student
  
  student = create_student()