input: Write a function that takes a list of strings and searches for any matches in a user-provided input string. If a match is found, return "String matches"; otherwise, return "String doesn't match". If the list is empty, return "String doesn't match".
  
  assert search_string(["First","Second","Third"], "First") == "String matches"
  assert search_string(["First","Second","Third"], "Fo") == "String matches"
  assert search_string(["First","Second","Third"], "Fourth") == "String doesn't match"
  assert search_string([], "First") == "String doesn't match"
  assert search_string(["First","Second","Third"], "") == "String doesn't match"
output: def search_string(string_list, input_string):
      if not string_list:
          return "String doesn't match"
      for s in string_list:
          if input_string in s:
              return "String matches"
      return "String doesn't match"