input: Write a function to create an Employee object and retrieve details using the get_details method.
  assert create_employee('John Doe', 30, 50000).get_details() == 'Name: John Doe\nAge: 30\nSalary: 50000'
  assert create_employee('Jane Smith', 25, 60000).get_details() == 'Name: Jane Smith\nAge: 25\nSalary: 60000'
  assert create_employee('Alice Johnson', 35, 70000).get_details() == 'Name: Alice Johnson\nAge: 35\nSalary: 70000'
output: class Employee:
      def __init__(self, name, age, salary):
          self.name = name
          self.age = age
          self.salary = salary
  
      def get_details(self):
          return f'Name: {self.name}\nAge: {self.age}\nSalary: {self.salary}'
  
  def create_employee(name, age, salary):
      return Employee(name, age, salary)