def main(arg1: str, arg2: str) -> dict:

   # 验证输入参数是否为字符串

   if not isinstance(arg1, str) or not isinstance(arg2, str):

       raise ValueError("输入参数必须为字符串类型")

   import os

   root_directory = os.path.abspath(os.sep)

   print("当前根目录为:", root_directory)

   return {

       "result": arg1 + arg2,

       "file": root_directory

   }