diff --git a/LICENSE b/LICENSE
index d76398fe..5edbc07e 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2023 Chunel Feng
+Copyright (c) 2024 Chunel Feng
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/README.md b/README.md
index d4fc7200..f81f551c 100644
--- a/README.md
+++ b/README.md
@@ -303,7 +303,7 @@ int main() {
 * 提供`proto`定义文件
 * 添加`mutable`(异变)功能，提供依赖关系注册语法糖
 
-[2023.12.23 - v2.5.4 - Chunel]
+[2024.01.05 - v2.5.4 - Chunel]
 * 提供`test`内容，包含性能和功能方面的测试用例
 * 优化`event`(事件)机制，支持异步等待功能
 
diff --git a/src/CBasic/CStrDefine.h b/src/CBasic/CStrDefine.h
index a06abedf..b0ca4c6a 100644
--- a/src/CBasic/CStrDefine.h
+++ b/src/CBasic/CStrDefine.h
@@ -15,12 +15,11 @@
 
 CGRAPH_NAMESPACE_BEGIN
 
-static const std::string& CGRAPH_EMPTY = "";
-static const std::string& CGRAPH_DEFAULT = "default";
-static const std::string& CGRAPH_UNKNOWN = "unknown";
-static const std::string& CGRAPH_BASIC_EXCEPTION = "CGraph default exception";
-static const std::string& CGRAPH_FUNCTION_NO_SUPPORT = "CGraph function no support";
-static const std::string& CGRAPH_INPUT_IS_NULL = "input is nullptr";
+static const char* CGRAPH_EMPTY = "";
+static const char* CGRAPH_DEFAULT = "default";
+static const char* CGRAPH_UNKNOWN = "unknown";
+static const char* CGRAPH_FUNCTION_NO_SUPPORT = "function no support";
+static const char* CGRAPH_INPUT_IS_NULL = "input is nullptr";
 
 CGRAPH_NAMESPACE_END
 
diff --git a/src/UtilsCtrl/UtilsDefine.h b/src/UtilsCtrl/UtilsDefine.h
index c375d28c..cae4a870 100644
--- a/src/UtilsCtrl/UtilsDefine.h
+++ b/src/UtilsCtrl/UtilsDefine.h
@@ -69,7 +69,7 @@ CStatus __ASSERT_NOT_NULL(T t, Args... args) {
 template<typename T>
 CVoid __ASSERT_NOT_NULL_THROW_EXCEPTION(T t) {
     if (unlikely(nullptr == t)) {
-        CGRAPH_THROW_EXCEPTION("[CException] " + CGRAPH_INPUT_IS_NULL)
+        CGRAPH_THROW_EXCEPTION("[CException] " + std::string(CGRAPH_INPUT_IS_NULL))
     }
 }
 
diff --git a/xmake.lua b/xmake.lua
index 6b07eb90..8a251016 100644
--- a/xmake.lua
+++ b/xmake.lua
@@ -37,7 +37,12 @@ tutorial_list = {
         "T18-Event",
         "T19-Cancel",
         "T20-YieldResume",
-        "T21-MultiCondition"
+        "T21-MultiCondition",
+        "T22-Timeout",
+        "T23-Some",
+        "T24-Fence",
+        "T25-Coordinator",
+        "T26-Mutable"
 }
 
 -- add tutorial target one by one
@@ -47,4 +52,4 @@ for _, v in pairs(tutorial_list) do
         add_includedirs("src")
         add_headerfiles("src/CGraph.h")
         add_files("src/**.cpp", string.format("tutorial/%s.cpp", v))
-end
\ No newline at end of file
+end