input: Write a python function to create an instance of the Student class and return its attributes as a dictionary.
  assert create_student("Alice", 21, "123-456-7890") == {"name": "Alice", "age": 21, "phone_number": "123-456-7890"}
  assert create_student("Bob", 25, "987-654-3210") == {"name": "Bob", "age": 25, "phone_number": "987-654-3210"}
  assert create_student("Charlie", 19, "555-123-4567") == {"name": "Charlie", "age": 19, "phone_number": "555-123-4567"}
output: class Student:
      def __init__(self, name, age, phone_number):
          self.name = name
          self.age = age
          self.phone_number = phone_number
  
  def create_student(name, age, phone_number):
      student = Student(name, age, phone_number)
      return {"name": student.name, "age": student.age, "phone_number": student.phone_number}