input: Write a python function to convert a JSON string to a Python dictionary.
  assert json_string_to_dict('{"name": "John", "age": 30, "city": "New York"}') == {"name": "John", "age": 30, "city": "New York"}
  assert json_string_to_dict('{"fruit": "Apple", "size": "Large", "color": "Red"}') == {"fruit": "Apple", "size": "Large", "color": "Red"}
  assert json_string_to_dict('{}') == {}
output: def json_string_to_dict(json_string):
      import json
      return json.loads(json_string)