input: Write a python function to store and retrieve user data in a JSON file.
  assert store_user_data({"Name": "Alice", "Age": 30, "City": "Los Angeles"})==None
  assert get_user_data() == {"Name": "Alice", "Age": 30, "City": "Los Angeles"}
  assert store_user_data({"Name": "Bob", "Age": 22, "City": "Chicago"})==None
  assert get_user_data() == {"Name": "Bob", "Age": 22, "City": "Chicago"}
output: import json
  
  def store_user_data(user_data):
      with open('user_data.json', 'w') as json_file:
          json.dump(user_data, json_file)
  
  def get_user_data():
      with open('user_data.json', 'r') as json_file:
          user_data = json.load(json_file)
      return user_data