diff --git a/.clang-format b/.clang-format
index 554a685..cede7d5 100644
--- a/.clang-format
+++ b/.clang-format
@@ -6,4 +6,5 @@ BreakBeforeBraces: Attach
 AllowShortIfStatementsOnASingleLine: false
 AllowShortLoopsOnASingleLine: false
 AllowShortFunctionsOnASingleLine: Inline
-ColumnLimit: 0
+ColumnLimit: 120
+AlignEscapedNewlines: Left
diff --git a/.clang-tidy b/.clang-tidy
new file mode 100644
index 0000000..8f5b23d
--- /dev/null
+++ b/.clang-tidy
@@ -0,0 +1,11 @@
+Checks: >
+  clang-analyzer-*,
+  bugprone-*,
+  misc-*,
+  readability-*,
+  -readability-magic-numbers,
+  -readability-identifier-length,
+  -misc-unused-parameters,
+  -misc-include-cleaner
+
+HeaderFilterRegex: 'src/.*'
diff --git a/.gitignore b/.gitignore
index 3412e37..5ad959c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,11 +1,14 @@
 .DS_Store
-*.o
-.so
-*.dylib
-build
+*log*.txt
 
+/tmp
+/build
+
+# VSCode
 .vscode/*
 !.vscode/c_cpp_properties.json
+!.vscode/extensions.json
 !.vscode/launch.json
 !.vscode/settings.json
 !.vscode/tasks.json
+
diff --git a/.vscode/c_cpp_properties.json b/.vscode/c_cpp_properties.json
new file mode 100644
index 0000000..cbd449f
--- /dev/null
+++ b/.vscode/c_cpp_properties.json
@@ -0,0 +1,12 @@
+{
+    "configurations": [
+        {
+            "name": "Mac",
+            "compileCommands": "${workspaceFolder}/build/compile_commands.json",
+            "compilerPath": "/usr/bin/clang",
+            "cStandard": "c11",
+            "intelliSenseMode": "macos-clang-arm64"
+        }
+    ],
+    "version": 4
+}
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
new file mode 100644
index 0000000..c03d5b9
--- /dev/null
+++ b/.vscode/extensions.json
@@ -0,0 +1,6 @@
+{
+  "recommendations": [
+    "ms-vscode.cpptools",
+    "ms-vscode.cmake-tools"
+  ]
+}
diff --git a/.vscode/settings.json b/.vscode/settings.json
index b35902f..69aa14d 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -6,18 +6,28 @@
     "editor.formatOnSave": true,
     "editor.defaultFormatter": "ms-vscode.cpptools"
   },
+  "[json]": {
+    "editor.defaultFormatter": "vscode.json-language-features"
+  },
+  "[markdown]": {
+    "editor.defaultFormatter": "denoland.vscode-deno",
+    "editor.formatOnSave": true
+  },
+  "files.associations": {
+    "*.jsonl": "json",
+    ".clang-format": "yaml",
+  },
   "cSpell.words": [
     "armv",
     "CMSIS",
+    "cppcheck",
     "ctest",
     "Dryrun",
     "eabi",
     "libnewlib",
     "noninteractive",
     "tinyclib",
-    "trunc"
+    "trunc",
+    "xcrun"
   ],
-  "files.associations": {
-    ".clang-format": "yaml",
-  }
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f0fcfd7..ba8c8be 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 # Changelog
 
-See https://common-changelog.org for commit guidelines.
+See https://common-changelog.org for commit guidelines and https://semver.org
+for versioning.
 
 ## v0.1.1 - 2025-04-27
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1a603cf..8f4e4c9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,19 +1,22 @@
 cmake_minimum_required(VERSION 3.25)
 
-project(tinyclib VERSION 0.1.0 LANGUAGES C)
+project(tinyclib VERSION 0.1.1 LANGUAGES C)
 
-# Set the output directories
+# Settings
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/lib)
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/lib)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/bin)
 
+# Dependencies
+include(FetchContent)
 # Sources
 file(GLOB SOURCES CONFIGURE_DEPENDS src/*.c)
 
 # Add the library (BUILD_SHARED_LIBS is handled by CMake)
 add_library(tinyclib ${SOURCES})
 
-# Set the C standard to C11 for now
+# Set the C standard
 set_property(TARGET tinyclib PROPERTY C_STANDARD 11)
 set_property(TARGET tinyclib PROPERTY C_STANDARD_REQUIRED ON)
 set_property(TARGET tinyclib PROPERTY C_EXTENSIONS OFF)
@@ -81,22 +84,22 @@ if(BUILD_TESTS)
 
   # FetchContent for Unity testing framework
   FetchContent_Declare(
-      Unity
-      GIT_REPOSITORY https://github.com/ThrowTheSwitch/Unity.git
-      GIT_TAG v2.6.1
+    Unity
+    GIT_REPOSITORY https://github.com/ThrowTheSwitch/Unity.git
+    GIT_TAG v2.6.1
   )
   FetchContent_MakeAvailable(Unity)
   FetchContent_GetProperties(Unity)
 
   if(NOT TARGET Unity)
-      add_library(Unity STATIC ${unity_SOURCE_DIR}/src/unity.c)
+    add_library(Unity STATIC ${unity_SOURCE_DIR}/src/unity.c)
   endif()
   target_include_directories(Unity PUBLIC ${unity_SOURCE_DIR}/src)
 
   enable_testing()
   foreach(t app config debug error test)
     add_executable(tl_${t}_test tests/arch/generic/tl_${t}_test.c)
-    target_link_libraries(tl_${t}_test Unity tinyclib)
+    target_link_libraries(tl_${t}_test unity tinyclib)
     add_test(NAME tl_${t}_test COMMAND tl_${t}_test)
   endforeach()
 endif()
diff --git a/CMakePresets.json b/CMakePresets.json
index e4b7105..183a981 100644
--- a/CMakePresets.json
+++ b/CMakePresets.json
@@ -11,6 +11,7 @@
       "binaryDir": "${sourceDir}/build",
       "cacheVariables": {
         "CMAKE_BUILD_TYPE": "Debug",
+        "CMAKE_EXPORT_COMPILE_COMMANDS": "ON",
         "BUILD_TESTS": "ON"
       }
     }
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..8c786dc
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,49 @@
+.PHONY: help install build clean test format lint check check-all fix
+
+BUILD_DIR := build
+CLANG_FORMAT := $(shell if command -v clang-format >/dev/null 2>&1; then echo clang-format; fi)
+CLANG_TIDY := $(shell if command -v clang-tidy >/dev/null 2>&1; then echo clang-tidy; fi)
+CPPCHECK := $(shell if command -v cppcheck >/dev/null 2>&1; then echo cppcheck; fi)
+CLANG_TIDY_EXTRA_ARGS := $(shell if [ "$$(uname)" = "Darwin" ]; then echo "--extra-arg=--sysroot=$$(xcrun --show-sdk-path)"; fi)
+
+SRC_FILES := src/*.c include/*.h
+TEST_FILES := tests/arch/generic/*.c
+ALL_FILES := $(SRC_FILES) $(TEST_FILES)
+
+help: ## Show available make targets
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | \
+		awk 'BEGIN {FS = ":.*?## "}; {printf "  %-15s %s\n", $$1, $$2}'
+
+configure: ## Configure cmake
+	cmake --preset default
+
+build: ## Build the project
+	cmake --build --preset default
+
+clean: ## Remove build directory
+	@test -n "$(CURDIR)" && [ "$(CURDIR)" != "/" ]
+	rm -rf "$(CURDIR)/$(BUILD_DIR)"
+
+test: ## Build and run tests
+	cmake --workflow --preset default
+
+format: ## Check code formatting
+	@test -n "$(CLANG_FORMAT)" || { echo "error: clang-format not found"; exit 1; }
+	$(CLANG_FORMAT) --dry-run --Werror $(ALL_FILES) --verbose
+
+lint: ## Check code linting
+	@test -n "$(CLANG_TIDY)" || { echo "error: clang-tidy not found"; exit 1; }
+	$(CLANG_TIDY) -p $(BUILD_DIR) $(CLANG_TIDY_EXTRA_ARGS) \
+		--header-filter="^$(CURDIR)/(src|include|tests)/" src/*.c tests/arch/generic/*.c
+
+check: ## Static analysis
+	@test -n "$(CPPCHECK)" || { echo "error: cppcheck not found"; exit 1; }
+	$(CPPCHECK) --enable=warning,style,performance,portability --error-exitcode=1 \
+		--project=$(BUILD_DIR)/compile_commands.json --suppress=missingIncludeSystem \
+		-i$(BUILD_DIR)
+
+check-all: format lint check ## Run all checks
+
+fix: ## Fix code formatting and linting issues
+	@test -n "$(CLANG_FORMAT)" || { echo "error: clang-format not found"; exit 1; }
+	$(CLANG_FORMAT) -i $(ALL_FILES)
diff --git a/README.md b/README.md
index 2e2e9de..92460fb 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,15 @@
 # tinyclib - A tiny C library
 
-tinyclib is a tiny C library for building applications across various platforms, 
+tinyclib is a tiny C library for building applications across various platforms,
 from server-grade hardware to desktops, mobile, and embedded devices.
 
 ## Requirements
 
 - [Clang](https://clang.llvm.org/) or similar C compiler
 - [CMake](https://cmake.org/)
+- [Ninja](https://github.com/ninja-build/ninja)
+
+See [mise.toml](mise.toml) for exact versions used.
 
 ### Recommended tools
 
@@ -17,9 +20,8 @@ from server-grade hardware to desktops, mobile, and embedded devices.
 ## Installation
 
 ```shell
-git clone https://github.com/devfacet/tinyclib.git
-cd tinyclib/
-cmake --workflow --preset default
+make configure
+make build
 ```
 
 ## Usage
@@ -27,7 +29,7 @@ cmake --workflow --preset default
 ## Test
 
 ```shell
-ctest --preset default
+make test
 ```
 
 ## Contributing
@@ -36,5 +38,6 @@ See [CONTRIBUTING.md](CONTRIBUTING.md)
 
 ## License
 
-Licensed under The MIT License (MIT)  
-For the full copyright and license information, please view the LICENSE.txt file.
+Licensed under The MIT License (MIT)\
+For the full copyright and license information, please view the LICENSE.txt
+file.
diff --git a/include/tl_config.h b/include/tl_config.h
index 5a1edcf..4eaaf8f 100644
--- a/include/tl_config.h
+++ b/include/tl_config.h
@@ -22,7 +22,7 @@
  *
  * @note Available for all ARM architectures.
  */
-#if defined(__ARM_ARCH)
+#ifdef __ARM_ARCH
 #define TL_CMSIS_DSP_AVAILABLE 1
 #else
 #define TL_CMSIS_DSP_AVAILABLE 0
diff --git a/include/tl_debug.h b/include/tl_debug.h
index acbe839..e917b71 100644
--- a/include/tl_debug.h
+++ b/include/tl_debug.h
@@ -12,7 +12,7 @@
  * @param level The debug level.
  * @param fmt The format string.
  * @param ... The arguments.
- * 
+ *
  * @return void
  */
 #define TL_DEBUG_PRINT(level, fmt, ...)          \
diff --git a/include/tl_error.h b/include/tl_error.h
index cd54d10..c4bbdba 100644
--- a/include/tl_error.h
+++ b/include/tl_error.h
@@ -11,28 +11,28 @@
 typedef enum {
     TL_ERROR_NONE = 0, // no error
 
-    TL_ERROR_INTERNAL = 10,   // internal error
-    TL_ERROR_NOT_FOUND,       // not found
-    TL_ERROR_NOT_READY,       // not ready
-    TL_ERROR_NOT_IMPLEMENTED, // not implemented
-    TL_ERROR_NOT_SUPPORTED,   // not supported
-    TL_ERROR_NOT_AVAILABLE,   // not available
-
-    TL_ERROR_TIMEOUT = 20,      // timeout error
-    TL_ERROR_BUSY,              // busy
-    TL_ERROR_IO,                // I/O error
-    TL_ERROR_OUT_OF_RANGE,      // out of range error
-    TL_ERROR_MEMORY_ALLOCATION, // memory allocation error
-
-    TL_ERROR_INIT_FAILED = 30,    // initialization error
-    TL_ERROR_ALREADY_INITIALIZED, // already initialized
-    TL_ERROR_NOT_INITIALIZED,     // not initialized
-    TL_ERROR_INVALID_ARGUMENT,    // invalid argument
-    TL_ERROR_INVALID_FUNCTION,    // invalid function
-    TL_ERROR_INVALID_INSTANCE,    // invalid instance
-    TL_ERROR_INVALID_SIZE,        // invalid size
-    TL_ERROR_INVALID_TYPE,        // invalid type
-    TL_ERROR_INVALID_VALUE,       // invalid value
+    TL_ERROR_INTERNAL = 10,        // internal error
+    TL_ERROR_NOT_FOUND = 11,       // not found
+    TL_ERROR_NOT_READY = 12,       // not ready
+    TL_ERROR_NOT_IMPLEMENTED = 13, // not implemented
+    TL_ERROR_NOT_SUPPORTED = 14,   // not supported
+    TL_ERROR_NOT_AVAILABLE = 15,   // not available
+
+    TL_ERROR_TIMEOUT = 20,           // timeout error
+    TL_ERROR_BUSY = 21,              // busy
+    TL_ERROR_IO = 22,                // I/O error
+    TL_ERROR_OUT_OF_RANGE = 23,      // out of range error
+    TL_ERROR_MEMORY_ALLOCATION = 24, // memory allocation error
+
+    TL_ERROR_INIT_FAILED = 30,         // initialization error
+    TL_ERROR_ALREADY_INITIALIZED = 31, // already initialized
+    TL_ERROR_NOT_INITIALIZED = 32,     // not initialized
+    TL_ERROR_INVALID_ARGUMENT = 33,    // invalid argument
+    TL_ERROR_INVALID_FUNCTION = 34,    // invalid function
+    TL_ERROR_INVALID_INSTANCE = 35,    // invalid instance
+    TL_ERROR_INVALID_SIZE = 36,        // invalid size
+    TL_ERROR_INVALID_TYPE = 37,        // invalid type
+    TL_ERROR_INVALID_VALUE = 38,       // invalid value
 } TLErrorCode;
 
 /**
diff --git a/include/tl_test.h b/include/tl_test.h
index 5d57a9f..93705f3 100644
--- a/include/tl_test.h
+++ b/include/tl_test.h
@@ -13,6 +13,6 @@
  *
  * @return The difference between the two timespec structures in nanoseconds.
  */
-long long tl_timespec_diff_ns(struct timespec *start, struct timespec *end);
+long long tl_timespec_diff_ns(const struct timespec *start, const struct timespec *end);
 
 #endif // TL_TEST_H
diff --git a/mise.toml b/mise.toml
new file mode 100644
index 0000000..df13554
--- /dev/null
+++ b/mise.toml
@@ -0,0 +1,10 @@
+# mise settings set experimental true
+# mise install
+
+[tools]
+cmake = "4.3.0"
+"conda:make" = "4.4.1"
+ninja = "1.13.2"
+"pipx:clang-format" = "latest"
+"pipx:clang-tidy" = "latest"
+"pipx:cppcheck" = "latest"
diff --git a/src/tl_app.c b/src/tl_app.c
index 8d46323..46fd3c0 100644
--- a/src/tl_app.c
+++ b/src/tl_app.c
@@ -13,7 +13,7 @@ static char **args = NULL;
 void tl_init_app(int argc, char *argv[]) {
     tl_parse_args(argc, argv);
     if (tl_get_flag("--debug-level")) {
-        tl_set_debug_level(atoi(tl_get_flag("--debug-level")));
+        tl_set_debug_level((int)strtol(tl_get_flag("--debug-level"), NULL, 10));
     }
 }
 
@@ -25,7 +25,8 @@ void tl_parse_args(int argc, char *argv[]) {
 bool tl_lookup_flag(const char *flag) {
     for (int i = 1; i < arg_count; i++) {
         // If the argument starts with the flag and is followed by either '\0' or '=' then
-        if (strncmp(args[i], flag, strlen(flag)) == 0 && (args[i][strlen(flag)] == '\0' || args[i][strlen(flag)] == '=')) {
+        if (strncmp(args[i], flag, strlen(flag)) == 0 &&
+            (args[i][strlen(flag)] == '\0' || args[i][strlen(flag)] == '=')) {
             return true;
         }
     }
diff --git a/src/tl_error.c b/src/tl_error.c
index f73c3d5..59fb3f1 100644
--- a/src/tl_error.c
+++ b/src/tl_error.c
@@ -7,14 +7,9 @@
 #include <string.h>
 
 void tl_error_set(TLError *error, TLErrorCode code, const char *message, ...) {
-    // Check and initialize error
+    // Ignore if error is NULL
     if (!error) {
-        error = malloc(sizeof(TLError));
-        if (!error) {
-            return;
-        }
-        error->message = NULL;
-        error->message_size = 0;
+        return;
     }
 
     // Set error code and message
diff --git a/src/tl_test.c b/src/tl_test.c
index 41d96a6..dedad52 100644
--- a/src/tl_test.c
+++ b/src/tl_test.c
@@ -1,12 +1,10 @@
 // See LICENSE.txt and CONTRIBUTING.md for details.
 
-#define _POSIX_C_SOURCE 199309L
-
 #include "tl_test.h"
 #include <time.h>
 
 // TODO: Add tests
 
-long long tl_timespec_diff_ns(struct timespec *start, struct timespec *end) {
-    return (end->tv_sec - start->tv_sec) * 1000000000LL + (end->tv_nsec - start->tv_nsec);
+long long tl_timespec_diff_ns(const struct timespec *start, const struct timespec *end) {
+    return ((end->tv_sec - start->tv_sec) * 1000000000LL) + (end->tv_nsec - start->tv_nsec);
 }
diff --git a/tests/arch/generic/tl_app_test.c b/tests/arch/generic/tl_app_test.c
index 8c0c821..f9a5848 100644
--- a/tests/arch/generic/tl_app_test.c
+++ b/tests/arch/generic/tl_app_test.c
@@ -9,27 +9,27 @@ void tearDown(void) {
     // Teardown code if needed
 }
 
-void test_tl_init_app(void) {
+static void test_tl_init_app(void) {
     char *argv[] = {"program", "--debug-level=2"};
     tl_init_app(2, argv);
     TEST_ASSERT_TRUE(tl_lookup_flag("--debug-level"));
     TEST_ASSERT_EQUAL_STRING("2", tl_get_flag("--debug-level"));
 }
 
-void test_tl_parse_args(void) {
+static void test_tl_parse_args(void) {
     char *argv[] = {"program", "--test-flag"};
     tl_parse_args(2, argv);
     TEST_ASSERT_TRUE(tl_lookup_flag("--test-flag"));
 }
 
-void test_tl_lookup_flag(void) {
+static void test_tl_lookup_flag(void) {
     char *argv[] = {"program", "--test-flag"};
     tl_init_app(2, argv);
     TEST_ASSERT_TRUE(tl_lookup_flag("--test-flag"));
     TEST_ASSERT_FALSE(tl_lookup_flag("--nonexistent-flag"));
 }
 
-void test_tl_get_flag(void) {
+static void test_tl_get_flag(void) {
     char *argv[] = {"program", "--key=value"};
     tl_init_app(2, argv);
     TEST_ASSERT_EQUAL_STRING("value", tl_get_flag("--key"));
diff --git a/tests/arch/generic/tl_config_test.c b/tests/arch/generic/tl_config_test.c
index 43f4ae3..eca5664 100644
--- a/tests/arch/generic/tl_config_test.c
+++ b/tests/arch/generic/tl_config_test.c
@@ -9,17 +9,17 @@ void tearDown(void) {
     // Teardown code if needed
 }
 
-void test_tl_get_debug_level(void) {
+static void test_tl_get_debug_level(void) {
     tl_set_debug_level(3);
     TEST_ASSERT_EQUAL(3, tl_get_debug_level());
 }
 
-void test_tl_set_debug_level(void) {
+static void test_tl_set_debug_level(void) {
     TEST_ASSERT_TRUE(tl_set_debug_level(5));
     TEST_ASSERT_EQUAL(5, tl_get_debug_level());
 }
 
-void test_tl_neon_available(void) {
+static void test_tl_neon_available(void) {
 #if TL_NEON_AVAILABLE
     TEST_ASSERT_TRUE(tl_neon_available());
 #else
@@ -27,7 +27,7 @@ void test_tl_neon_available(void) {
 #endif
 }
 
-void test_tl_cmsis_dsp_available(void) {
+static void test_tl_cmsis_dsp_available(void) {
 #if TL_CMSIS_DSP_AVAILABLE
     TEST_ASSERT_TRUE(tl_cmsis_dsp_available());
 #else
diff --git a/tests/arch/generic/tl_debug_test.c b/tests/arch/generic/tl_debug_test.c
index db17ca1..c78132f 100644
--- a/tests/arch/generic/tl_debug_test.c
+++ b/tests/arch/generic/tl_debug_test.c
@@ -9,7 +9,7 @@ void tearDown(void) {
     // Teardown code if needed
 }
 
-void test_tl_debug_functionality(void) {
+static void test_tl_debug_functionality(void) {
     // Example test for tl_debug functionality
     TEST_ASSERT_TRUE(1); // Replace with actual tests
 }
diff --git a/tests/arch/generic/tl_error_test.c b/tests/arch/generic/tl_error_test.c
index e0d591f..13b8d71 100644
--- a/tests/arch/generic/tl_error_test.c
+++ b/tests/arch/generic/tl_error_test.c
@@ -11,33 +11,30 @@ void tearDown(void) {
     // Teardown code if needed
 }
 
-void test_tl_error_set_with_fixed_message(void) {
+static void test_tl_error_set_with_fixed_message(void) {
     TLError error = {0};
-    tl_error_set(&error, 1, "fixed error message");
+    tl_error_set(&error, TL_ERROR_INTERNAL, "fixed error message");
 
-    TEST_ASSERT_EQUAL(1, error.code);
+    TEST_ASSERT_EQUAL(TL_ERROR_INTERNAL, error.code);
     TEST_ASSERT_NOT_NULL(error.message);
     TEST_ASSERT_EQUAL_STRING("fixed error message", error.message);
 
     free((void *)error.message);
 }
 
-void test_tl_error_set_with_formatted_message(void) {
+static void test_tl_error_set_with_formatted_message(void) {
     TLError error = {0};
-    tl_error_set(&error, 2, "formatted error: %d", 42);
+    tl_error_set(&error, TL_ERROR_NOT_FOUND, "formatted error: %d", 42);
 
-    TEST_ASSERT_EQUAL(2, error.code);
+    TEST_ASSERT_EQUAL(TL_ERROR_NOT_FOUND, error.code);
     TEST_ASSERT_NOT_NULL(error.message);
     TEST_ASSERT_EQUAL_STRING("formatted error: 42", error.message);
 
     free((void *)error.message);
 }
 
-void test_tl_error_set_with_null_error(void) {
-    tl_error_set(NULL, 3, "this should not crash");
-
-    TEST_ASSERT_EQUAL(3, 3);
-    TEST_ASSERT_EQUAL_STRING("this should not crash", "this should not crash");
+static void test_tl_error_set_with_null_error(void) {
+    tl_error_set(NULL, TL_ERROR_NOT_READY, "this should not crash");
 }
 
 int main(void) {
diff --git a/tests/arch/generic/tl_test_test.c b/tests/arch/generic/tl_test_test.c
index b33625e..005493c 100644
--- a/tests/arch/generic/tl_test_test.c
+++ b/tests/arch/generic/tl_test_test.c
@@ -10,7 +10,7 @@ void tearDown(void) {
     // Teardown code if needed
 }
 
-void test_tl_timespec_diff_ns(void) {
+static void test_tl_timespec_diff_ns(void) {
     struct timespec start = {.tv_sec = 1, .tv_nsec = 500000000};
     struct timespec end = {.tv_sec = 2, .tv_nsec = 200000000};