diff --git a/typora.py b/typora.py
index 2a18726..ef18d7b 100644
--- a/typora.py
+++ b/typora.py
@@ -16,6 +16,7 @@ from loguru import logger as log
 from masar import extract_asar, pack_asar
 from shutil import rmtree
 from argparse import ArgumentParser
+import struct
 import sys
 
 # DEBUG
@@ -27,17 +28,13 @@ if DEBUG:
 else:
     log.add(sys.stderr, level="INFO")
 
-key = [0x4B029A9482B3E14E, 0xF157FEB4B4522F80, 0xE25692105308F4BE, 0x6DD58DDDA3EC0DC2]
-aesKey = b""
-for akey in key:
-    aesKey += int.to_bytes(akey, byteorder="little", length=8)
+AES_KEY = struct.pack("<4Q", *[0x4B029A9482B3E14E, 0xF157FEB4B4522F80, 0xE25692105308F4BE, 0x6DD58DDDA3EC0DC2])
 
 
-def _mkdir(_path):
-    try:
-        makedirs(_path)
-    except FileExistsError:
-        log.warning(f"May FolderExists: {_path}")
+def _newDir(_path):
+    if exists(_path):
+        rmtree(_path)
+    makedirs(_path)
 
 
 def decScript(b64: bytes, prettify: bool):
@@ -47,7 +44,7 @@ def decScript(b64: bytes, prettify: bool):
     # cipher text
     cipherText = lCode[16:]
     # AES 256 CBC
-    ins = AES.new(key=aesKey, iv=aesIv, mode=AES.MODE_CBC)
+    ins = AES.new(key=AES_KEY, iv=aesIv, mode=AES.MODE_CBC)
     code = unpad(ins.decrypt(cipherText), 16, 'pkcs7')
     if prettify:
         code = beautify(code.decode()).encode()
@@ -61,8 +58,8 @@ def extractWdec(asarPath, path, prettify):
     :return: None
     """
     # try to create empty dir to save extract files
-    path = pjoin(path, "temp")
-    _mkdir(path)
+    path = pjoin(path, "typoraCrackerTemp")
+    _newDir(path)
     log.info(f"extract asar file: {asarPath}")
     # extract app.asar to {path}/*
     extract_asar(asarPath, path)
@@ -72,7 +69,7 @@ def extractWdec(asarPath, path, prettify):
     # construct the save directory {pathRoot}/dec_app
     outPath = pjoin(psplit(path)[0], "dec_app")
     # try to create empty dir to save decryption files
-    _mkdir(outPath)
+    _newDir(outPath)
     log.info(f"set Directory: {outPath}")
     # enumerate extract files
     fileArr = listdir(path)
@@ -99,7 +96,7 @@ def encScript(_code: bytes, compress):
         _code = jsmin(_code.decode(), quote_chars="'\"`").encode()
     aesIv = urandom(16)
     cipherText = _code
-    ins = AES.new(key=aesKey, iv=aesIv, mode=AES.MODE_CBC)
+    ins = AES.new(key=AES_KEY, iv=aesIv, mode=AES.MODE_CBC)
     enc = aesIv + ins.encrypt(pad(cipherText, 16, 'pkcs7'))
     lCode = b64encode(enc)
     return lCode
@@ -115,11 +112,11 @@ def packWenc(path, outPath, compress):
     if isfile(outPath):
         log.error("plz input Directory for app.asar")
         raise NotADirectoryError
-    if not exists(outPath):
-        _mkdir(outPath)
 
-    encFilePath = pjoin(psplit(outPath)[0], "temp")
-    _mkdir(encFilePath)
+    _newDir(outPath)
+
+    encFilePath = pjoin(psplit(outPath)[0], "typoraCrackerTemp")
+    _newDir(encFilePath)
 
     outFilePath = pjoin(outPath, "app.asar")
     log.info(f"set outFilePath: {outFilePath}")