diff --git a/src/model2mem.cpp b/src/model2mem.cpp
index 65ec562..9c77ad6 100644
--- a/src/model2mem.cpp
+++ b/src/model2mem.cpp
@@ -7,77 +7,67 @@ using namespace std;
 // 加密密钥
 string ENCRYPTION_KEY = "";
 
-static int write_file(const std::string & fname, std::vector<char>& buf){
+static int write_file(const std::string& fname, std::vector<char>& buf) {
     std::ofstream fs(fname, std::ios::binary | std::ios::out);
-    if(!fs.good()){
-        std::cerr<<fname<<" does not exist"<<std::endl;
+    if (!fs.good()) {
+        std::cerr << fname << " does not exist" << std::endl;
         return -1;
     }
     // 加密数据
     size_t keyIndex = 0;
-    for(char &c : buf) {
-        c ^= ENCRYPTION_KEY[keyIndex];
-        keyIndex = (keyIndex + 1) % ENCRYPTION_KEY.length();
-        fs << (int)((unsigned char)c) << ",";
+    if (ENCRYPTION_KEY.length() > 0) {
+        for (char& c : buf) {
+            c ^= ENCRYPTION_KEY[keyIndex];
+            keyIndex = (keyIndex + 1) % ENCRYPTION_KEY.length();
+            fs << (int)((unsigned char)c) << ",";
+        }
+    }
+    else {
+        for (char& c : buf) {
+            fs << (int)((unsigned char)c) << ",";
+        }
     }
     fs.close();
     return 0;
 }
 
-static int load_file(const std::string & fname, std::vector<char>& buf){
+static int load_file(const std::string& fname, std::vector<char>& buf) {
     std::ifstream fs(fname, std::ios::binary | std::ios::in);
-    if(!fs.good()){
-        std::cerr<<fname<<" does not exist"<<std::endl;
+    if (!fs.good()) {
+        std::cerr << fname << " does not exist" << std::endl;
         return -1;
     }
 
     fs.seekg(0, std::ios::end);
-    int fsize=fs.tellg();
+    int fsize = fs.tellg();
 
     fs.seekg(0, std::ios::beg);
     buf.resize(fsize);
-    fs.read(buf.data(),fsize);
+    fs.read(buf.data(), fsize);
     fs.close();
-
-    // 解密数据
-    size_t keyIndex = 0;
-    for(char &c : buf) {
-        c ^= ENCRYPTION_KEY[keyIndex];
-        keyIndex = (keyIndex + 1) % ENCRYPTION_KEY.length();
-    }
     return 0;
 }
 
-int main(int argc, char** argv){
-    if(argc < 3) {
+int main(int argc, char** argv) {
+    if (argc < 3) {
         cout << "model2mem [input] [output] <pwd>" << endl;
         return -1;
     }
 
     vector<char> content;
     load_file(argv[1], content);
-    if(content.size() <= 0) {
+    if (content.size() <= 0) {
         cout << "do not read any content" << endl;
         return -1;
     }
 
     // 如果提供了密码，则进行加密操作
-    if(argc == 4) {
+    if (argc == 4) {
         ENCRYPTION_KEY = argv[3];
-        write_file(argv[2], content);
-    } else {
-        // 否则，直接写入文件
-        std::ofstream fs(argv[2], std::ios::binary | std::ios::out);
-        if(!fs.good())
-        {
-            std::cerr<<argv[2]<<" does not exist"<<std::endl;
-            return -1;
-        }
-        for(char c : content) {
-            fs << (int)((unsigned char)c) << ",";
-        }
-        fs.close();
     }
-
+    else {
+        ENCRYPTION_KEY = "";
+    }
+    write_file(argv[2], content);
     return 0;
 }