input: Write a function to search a user-input string in a given list of strings and return the result indicating if any match is found. If a match is found, return "Matches", otherwise return "Doesn't match". If the list of strings is empty, return "Doesn't match".
  assert search_string(["First","Second","Third"], "Second")=="Matches"
  assert search_string(["First","Second","Third"], "Fourth")=="Doesn't match"
  assert search_string([], "First")=="Doesn't match"
  assert search_string(["First"], "First")=="Matches"
  assert search_string(["First","Second","Third"], "Se")=="Matches"
output: def search_string(string_list, target):
      if not string_list:
          return "Doesn't match"
      for s in string_list:
          if target in s:
              return "Matches"
      return "Doesn't match"