input: Write a function to search a given list of strings for any matches with the user input. The function should return "String matches" if any string in the list matches the user input, otherwise it should return "String doesn't match". The list of strings is predefined.
  assert search_strings(["First", "Second", "Third"], "Second") == "String matches"
  assert search_strings(["First", "Second", "Third"], "Fifth") == "String doesn't match"
  assert search_strings(["First", "Second", "Third"], "") == "String doesn't match"
  assert search_strings([], "First") == "String doesn't match"
  assert search_strings(["First", "Second", "Third"], "third") == "String doesn't match"
output: def search_strings(string_list, user_input):
      if user_input in string_list:
          return "String matches"
      else:
          return "String doesn't match"