diff --git a/.clang-format b/.clang-format
index 41e0670..faaff93 100644
--- a/.clang-format
+++ b/.clang-format
@@ -1,2 +1,3 @@
 Language: Cpp
-BasedOnStyle: Google
\ No newline at end of file
+BasedOnStyle: Google
+IndentWidth: 4
\ No newline at end of file
diff --git a/Makefile b/Makefile
index 9c6acde..2167bc7 100644
--- a/Makefile
+++ b/Makefile
@@ -35,4 +35,7 @@ deploy-linux:
 	@$(MAKE) -C $(scripts_folder) deploy-linux build_options="$(build_options)"
 
 tests-ffi:
-	@$(MAKE) -C tests-ffi tests
\ No newline at end of file
+	@$(MAKE) -C tests-ffi tests
+
+fmt:
+	@$(MAKE) -C tools fmt
\ No newline at end of file
diff --git a/src/front_end/about_widget.cxx b/src/front_end/about_widget.cxx
index 0a22ace..412e1b5 100644
--- a/src/front_end/about_widget.cxx
+++ b/src/front_end/about_widget.cxx
@@ -17,19 +17,19 @@ using Self = AboutWidget;
 AboutWidget::AboutWidget() { show_about = make_unique<QPushButton>(); }
 
 void Self::setup_event() {
-  const auto function = [this]() {
-    if (!about_window) {
-      about_window = make_unique<AboutWindow>();
-    }
+    const auto function = [this]() {
+        if (!about_window) {
+            about_window = make_unique<AboutWindow>();
+        }
 
-    about_window->show_window();
-  };
+        about_window->show_window();
+    };
 
-  QObject::connect(show_about.get(), &QPushButton::clicked, function);
+    QObject::connect(show_about.get(), &QPushButton::clicked, function);
 }
 
 void Self::setup_widget(QGridLayout *grid_layout) {
-  show_about->setText("About");
-  this->setup_event();
-  grid_layout->addWidget(show_about.get(), 1, 1);
+    show_about->setText("About");
+    this->setup_event();
+    grid_layout->addWidget(show_about.get(), 1, 1);
 }
\ No newline at end of file
diff --git a/src/front_end/about_window.cxx b/src/front_end/about_window.cxx
index b73cad3..4cbd3ae 100644
--- a/src/front_end/about_window.cxx
+++ b/src/front_end/about_window.cxx
@@ -16,66 +16,67 @@ using std::make_unique;
 using Self = AboutWindow;
 
 AboutWindow::AboutWindow() {
-  about_window = make_unique<QDialog>();
-  grid_layout = make_unique<QGridLayout>();
-  github_button = make_unique<QPushButton>();
-  github_issue_button = make_unique<QPushButton>();
-  github_pull_button = make_unique<QPushButton>();
+    about_window = make_unique<QDialog>();
+    grid_layout = make_unique<QGridLayout>();
+    github_button = make_unique<QPushButton>();
+    github_issue_button = make_unique<QPushButton>();
+    github_pull_button = make_unique<QPushButton>();
 }
 
 void Self::is_open_browser_ok(OpenBrowserStatus status) {
-  switch (status) {
-    case OpenBrowserStatus::OK:
-      break;
-
-    case OpenBrowserStatus::OPEN_BROWSER_FAILED:
-      QMessageBox::critical(about_window.get(), "Error",
-                            "Could not open your browser");
-      break;
-
-    case OpenBrowserStatus::WRAP_RAW_C_FAILED:
-      QMessageBox::critical(about_window.get(), "Error",
-                            "Could not wrap C raw to safety string");
-
-      break;
-    case OpenBrowserStatus::URL_IS_EMPTY:
-      QMessageBox::critical(about_window.get(), "Error", "Url is empty");
-      break;
-  }
+    switch (status) {
+        case OpenBrowserStatus::OK:
+            break;
+
+        case OpenBrowserStatus::OPEN_BROWSER_FAILED:
+            QMessageBox::critical(about_window.get(), "Error",
+                                  "Could not open your browser");
+            break;
+
+        case OpenBrowserStatus::WRAP_RAW_C_FAILED:
+            QMessageBox::critical(about_window.get(), "Error",
+                                  "Could not wrap C raw to safety string");
+
+            break;
+        case OpenBrowserStatus::URL_IS_EMPTY:
+            QMessageBox::critical(about_window.get(), "Error", "Url is empty");
+            break;
+    }
 }
 
 void Self::open_browser_when_clicked(QPushButton *button, const char *url) {
-  const auto open_browser = [this, url] {
-    auto status = Lazyboard::ffi::open_browser(url);
-    is_open_browser_ok(status);
-  };
+    const auto open_browser = [this, url] {
+        auto status = Lazyboard::ffi::open_browser(url);
+        is_open_browser_ok(status);
+    };
 
-  QObject::connect(button, &QPushButton::clicked, open_browser);
+    QObject::connect(button, &QPushButton::clicked, open_browser);
 }
 
 void Self::setup_buttons() {
-  github_button->setText("GitHub | Source Code");
-  github_issue_button->setText("Issue | Bug Report");
-  github_pull_button->setText("Pull Request | Contribute");
-
-  this->open_browser_when_clicked(github_button.get(), GITHUB_URL);
-  this->open_browser_when_clicked(github_issue_button.get(), GITHUB_ISSUE_URL);
-  this->open_browser_when_clicked(github_pull_button.get(), GITHUB_PULL_URL);
-
-  grid_layout->addWidget(github_button.get(), 0, 0);
-  grid_layout->addWidget(github_issue_button.get(), 0, 1);
-  grid_layout->addWidget(github_pull_button.get(), 1, 0);
+    github_button->setText("GitHub | Source Code");
+    github_issue_button->setText("Issue | Bug Report");
+    github_pull_button->setText("Pull Request | Contribute");
+
+    this->open_browser_when_clicked(github_button.get(), GITHUB_URL);
+    this->open_browser_when_clicked(github_issue_button.get(),
+                                    GITHUB_ISSUE_URL);
+    this->open_browser_when_clicked(github_pull_button.get(), GITHUB_PULL_URL);
+
+    grid_layout->addWidget(github_button.get(), 0, 0);
+    grid_layout->addWidget(github_issue_button.get(), 0, 1);
+    grid_layout->addWidget(github_pull_button.get(), 1, 0);
 }
 
 void Self::setup_front_end() {
-  about_window->setLayout(this->grid_layout.get());
-  this->setup_buttons();
+    about_window->setLayout(this->grid_layout.get());
+    this->setup_buttons();
 }
 
 void Self::show_window() {
-  about_window->setMinimumSize(MIN_WIDTH, MIN_HEIGHT);
-  about_window->setWindowTitle("Lazyboard About");
+    about_window->setMinimumSize(MIN_WIDTH, MIN_HEIGHT);
+    about_window->setWindowTitle("Lazyboard About");
 
-  this->setup_front_end();
-  about_window->exec();
+    this->setup_front_end();
+    about_window->exec();
 }
\ No newline at end of file
diff --git a/src/front_end/main_window.cxx b/src/front_end/main_window.cxx
index 177fe5f..18a023a 100644
--- a/src/front_end/main_window.cxx
+++ b/src/front_end/main_window.cxx
@@ -17,33 +17,33 @@ using std::make_unique;
 using Self = MainWindow;
 
 Self::MainWindow() {
-  main_window = make_unique<QMainWindow>();
-  main_window_preload = make_unique<MainWindowPreload>();
-  auto central_w = make_unique<QWidget>();
-  auto layout_w = make_unique<QGridLayout>(central_w.get());
+    main_window = make_unique<QMainWindow>();
+    main_window_preload = make_unique<MainWindowPreload>();
+    auto central_w = make_unique<QWidget>();
+    auto layout_w = make_unique<QGridLayout>(central_w.get());
 
-  main_window->setCentralWidget(central_w.get());
+    main_window->setCentralWidget(central_w.get());
 
-  central_widget = central_w.release();
-  grid_layout = layout_w.release();
+    central_widget = central_w.release();
+    grid_layout = layout_w.release();
 }
 
 Self *Self::init_main_window() {
-  main_window->setMinimumSize(MIN_WIDTH, MIN_HEIGHT);
-  main_window->setWindowTitle("Lazyboard");
-  main_window_preload->create_default_config(main_window.get());
-  this->front_end_show();
-  main_window->show();
+    main_window->setMinimumSize(MIN_WIDTH, MIN_HEIGHT);
+    main_window->setWindowTitle("Lazyboard");
+    main_window_preload->create_default_config(main_window.get());
+    this->front_end_show();
+    main_window->show();
 
-  return this;
+    return this;
 }
 
 void Self::front_end_show() {
-  table_widget = make_unique<TableWidget>();
-  setting_widget = make_unique<SettingWidget>();
-  about_widget = make_unique<AboutWidget>();
+    table_widget = make_unique<TableWidget>();
+    setting_widget = make_unique<SettingWidget>();
+    about_widget = make_unique<AboutWidget>();
 
-  table_widget->setup_widget(this->grid_layout);
-  setting_widget->setup_widget(this->grid_layout);
-  about_widget->setup_widget(this->grid_layout);
+    table_widget->setup_widget(this->grid_layout);
+    setting_widget->setup_widget(this->grid_layout);
+    about_widget->setup_widget(this->grid_layout);
 }
\ No newline at end of file
diff --git a/src/front_end/main_window_preload.cxx b/src/front_end/main_window_preload.cxx
index 1c52cc5..9b92dc5 100644
--- a/src/front_end/main_window_preload.cxx
+++ b/src/front_end/main_window_preload.cxx
@@ -22,65 +22,65 @@ using std::stringstream;
 using namespace Lazyboard::ffi;
 
 void Self::on_error(WriteConfigStatus status, QMainWindow* main_window) {
-  switch (status) {
-    case WriteConfigStatus::OK:
-      break;
-
-    case WriteConfigStatus::CREATE_DIR_FAILED:
-      QMessageBox::critical(main_window, "Error",
-                            "Could not create config directory");
-      break;
-
-    case WriteConfigStatus::GET_DATA_LOCAL_FAILED:
-      QMessageBox::critical(main_window, "Error",
-                            "Could not get application local data");
-      break;
-
-    case WriteConfigStatus::CREATE_FILE_FAILED:
-      QMessageBox::critical(main_window, "Error",
-                            "Could not create configuration file");
-      break;
-
-    case WriteConfigStatus::WRITE_FILE_FAILED:
-      QMessageBox::critical(main_window, "Error",
-                            "Could not write configuration");
-      break;
-
-    case WriteConfigStatus::TOML_TO_STRING_FAILED:
-      QMessageBox::critical(main_window, "Error",
-                            "Could not convert TOML data to string");
-      break;
-  }
+    switch (status) {
+        case WriteConfigStatus::OK:
+            break;
+
+        case WriteConfigStatus::CREATE_DIR_FAILED:
+            QMessageBox::critical(main_window, "Error",
+                                  "Could not create config directory");
+            break;
+
+        case WriteConfigStatus::GET_DATA_LOCAL_FAILED:
+            QMessageBox::critical(main_window, "Error",
+                                  "Could not get application local data");
+            break;
+
+        case WriteConfigStatus::CREATE_FILE_FAILED:
+            QMessageBox::critical(main_window, "Error",
+                                  "Could not create configuration file");
+            break;
+
+        case WriteConfigStatus::WRITE_FILE_FAILED:
+            QMessageBox::critical(main_window, "Error",
+                                  "Could not write configuration");
+            break;
+
+        case WriteConfigStatus::TOML_TO_STRING_FAILED:
+            QMessageBox::critical(main_window, "Error",
+                                  "Could not convert TOML data to string");
+            break;
+    }
 }
 
 void Self::create_default_config(QMainWindow* main_window) {
-  auto local_data_raw = ffi::local_data();
+    auto local_data_raw = ffi::local_data();
 
-  stringstream string_stream;
-  string_stream << local_data_raw << "/Lazyboard";
-  string config_path = string_stream.str();
+    stringstream string_stream;
+    string_stream << local_data_raw << "/Lazyboard";
+    string config_path = string_stream.str();
 
-  auto is_config_exists = ffi::is_exists_path(config_path.data());
-  ffi::free_c_str(local_data_raw);
+    auto is_config_exists = ffi::is_exists_path(config_path.data());
+    ffi::free_c_str(local_data_raw);
 
-  if (!is_config_exists) {
-    // clang-format off
+    if (!is_config_exists) {
+        // clang-format off
       #if defined (LAZY_DEBUG)
         auto q_string_value = QString::fromStdString(config_path);
 
         qDebug() << "Config path not found, generate at: " <<  q_string_value << "\n";
       #endif
-    // clang-format on
+        // clang-format on
 
-    auto status = ffi::write_default_config();
-    on_error(status, main_window);
-  }
+        auto status = ffi::write_default_config();
+        on_error(status, main_window);
+    }
 
-  // clang-format off
+    // clang-format off
     #if defined (LAZY_DEBUG)
       auto q_string_value = QString::fromStdString(config_path);
 
       qDebug() << "Found config path at: " << q_string_value << "\n";
     #endif
-  // clang-format on
+    // clang-format on
 }
\ No newline at end of file
diff --git a/src/front_end/setting_widget.cxx b/src/front_end/setting_widget.cxx
index 0819dd4..befe4b0 100644
--- a/src/front_end/setting_widget.cxx
+++ b/src/front_end/setting_widget.cxx
@@ -12,7 +12,7 @@ using Self = SettingWidget;
 SettingWidget::SettingWidget() { open_setting = make_unique<QPushButton>(); }
 
 void Self::setup_widget(QGridLayout *grid_layout) {
-  open_setting->setText("Settings");
+    open_setting->setText("Settings");
 
-  grid_layout->addWidget(open_setting.get(), 0, 1);
+    grid_layout->addWidget(open_setting.get(), 0, 1);
 }
\ No newline at end of file
diff --git a/src/front_end/table_widget.cxx b/src/front_end/table_widget.cxx
index 7e3f79a..d7faa82 100644
--- a/src/front_end/table_widget.cxx
+++ b/src/front_end/table_widget.cxx
@@ -11,15 +11,16 @@ using std::make_unique;
 using Self = TableWidget;
 
 Self::TableWidget() noexcept {
-  table_widget = make_unique<QTableWidget>();
-  header_labels = {"Time", "Content", "Type", "Pinned"};
+    table_widget = make_unique<QTableWidget>();
+    header_labels = {"Time", "Content", "Type", "Pinned"};
 }
 
 void Self::setup_widget(QGridLayout* grid_layout) {
-  table_widget->setRowCount(DEFAULT_MAX_ROW);
-  table_widget->setColumnCount(4);
-  table_widget->setHorizontalHeaderLabels(header_labels);
-  table_widget->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);
+    table_widget->setRowCount(DEFAULT_MAX_ROW);
+    table_widget->setColumnCount(4);
+    table_widget->setHorizontalHeaderLabels(header_labels);
+    table_widget->horizontalHeader()->setSectionResizeMode(
+        QHeaderView::Stretch);
 
-  grid_layout->addWidget(table_widget.get(), 0, 0);
+    grid_layout->addWidget(table_widget.get(), 0, 0);
 }
\ No newline at end of file
diff --git a/src/main.cxx b/src/main.cxx
index ab3ce5c..42baa90 100644
--- a/src/main.cxx
+++ b/src/main.cxx
@@ -8,10 +8,11 @@ using std::make_unique;
 using std::unique_ptr;
 
 int main(int argc, char *argv[]) {
-  unique_ptr<QApplication> application = make_unique<QApplication>(argc, argv);
-  unique_ptr<MainWindow> main_window = make_unique<MainWindow>();
+    unique_ptr<QApplication> application =
+        make_unique<QApplication>(argc, argv);
+    unique_ptr<MainWindow> main_window = make_unique<MainWindow>();
 
-  main_window->init_main_window();
+    main_window->init_main_window();
 
-  return application->exec();
+    return application->exec();
 }
\ No newline at end of file
diff --git a/tests-ffi/config.cxx b/tests-ffi/config.cxx
index 0184d46..11c2147 100644
--- a/tests-ffi/config.cxx
+++ b/tests-ffi/config.cxx
@@ -9,12 +9,12 @@ using std::string;
 using std::uint8_t;
 
 enum WriteConfigStatus : uint8_t {
-  OK,
-  TOML_TO_STRING_FAILED,
-  CREATE_DIR_FAILED,
-  CREATE_FILE_FAILED,
-  WRITE_FILE_FAILED,
-  GET_DATA_LOCAL_FAILED,
+    OK,
+    TOML_TO_STRING_FAILED,
+    CREATE_DIR_FAILED,
+    CREATE_FILE_FAILED,
+    WRITE_FILE_FAILED,
+    GET_DATA_LOCAL_FAILED,
 };
 
 extern "C" char *raw_local_data();
@@ -22,23 +22,23 @@ extern "C" void raw_free_c_str(char *str);
 extern "C" WriteConfigStatus raw_write_default_config();
 
 void gen_config_test() {
-  auto status = raw_write_default_config();
-
-  assert(status != WriteConfigStatus::WRITE_FILE_FAILED);
-  assert(status != WriteConfigStatus::CREATE_FILE_FAILED);
-  assert(status != WriteConfigStatus::CREATE_DIR_FAILED);
-  assert(status != WriteConfigStatus::GET_DATA_LOCAL_FAILED);
-  assert(status != WriteConfigStatus::TOML_TO_STRING_FAILED);
-  assert(status == WriteConfigStatus::OK);
+    auto status = raw_write_default_config();
+
+    assert(status != WriteConfigStatus::WRITE_FILE_FAILED);
+    assert(status != WriteConfigStatus::CREATE_FILE_FAILED);
+    assert(status != WriteConfigStatus::CREATE_DIR_FAILED);
+    assert(status != WriteConfigStatus::GET_DATA_LOCAL_FAILED);
+    assert(status != WriteConfigStatus::TOML_TO_STRING_FAILED);
+    assert(status == WriteConfigStatus::OK);
 }
 
 int main() {
-  auto raw_result = raw_local_data();
-  auto result = string(raw_result);
-  raw_free_c_str(raw_result);
+    auto raw_result = raw_local_data();
+    auto result = string(raw_result);
+    raw_free_c_str(raw_result);
 
-  gen_config_test();
-  assert(!result.empty());
+    gen_config_test();
+    assert(!result.empty());
 
-  return 0;
+    return 0;
 }
\ No newline at end of file
diff --git a/tests-ffi/fs.cxx b/tests-ffi/fs.cxx
new file mode 100644
index 0000000..4e1b5ab
--- /dev/null
+++ b/tests-ffi/fs.cxx
@@ -0,0 +1,13 @@
+
+#include <cassert>
+extern "C" bool raw_is_path_exists(const char *path);
+
+int main() {
+    const char *valid_path = "../tests-ffi";
+    const char *wrong_path = "../abcxyzw1133";
+
+    assert(raw_is_path_exists(valid_path));
+    assert(!raw_is_path_exists(wrong_path));
+
+    return 0;
+}
\ No newline at end of file
diff --git a/tests-ffi/tests.sh b/tests-ffi/tests.sh
index 08dee4d..cfbb2da 100755
--- a/tests-ffi/tests.sh
+++ b/tests-ffi/tests.sh
@@ -43,14 +43,20 @@ function run_ffi_test() {
 	fi
 
 	for file in *.cxx; do
+		build_output=$(basename "$file" ".cxx")
 		file_name=$(basename "$file")
 
-		$clang_cxx "$file" "$static_lib_path" -o "$build_dir/$file_name"
+		$clang_cxx "$file" "$static_lib_path" -o "$build_dir/$build_output"
 		echo
-		echo -e "\e[0;32m[+] Test for $file_name:\e[0;37m"
-		./"$build_dir/$file_name"
+		echo -e -n "\e[0;32m[+] Test for $file_name:\e[0;37m"
 
-		echo -e "\e[0;32m[+] Test for $file_name success with status code: $?\e[0;37m"
+		time_test=$( {
+			time ./"$build_dir/$build_output"
+		} )
+
+		status_code=$?
+		echo -e -n "$time_test"
+		echo -e "\e[0;32m[+] Test for $file_name success with status code: $status_code\e[0;37m"
 
 		for _ in {1..25}; do
 			printf "_"
diff --git a/tools/Makefile b/tools/Makefile
new file mode 100644
index 0000000..241e091
--- /dev/null
+++ b/tools/Makefile
@@ -0,0 +1,3 @@
+
+fmt:
+	@./fmt.sh
\ No newline at end of file
diff --git a/tools/fmt.sh b/tools/fmt.sh
new file mode 100755
index 0000000..b448864
--- /dev/null
+++ b/tools/fmt.sh
@@ -0,0 +1,42 @@
+#!/bin/bash
+set -e
+
+current_dir=$(basename "$(pwd)")
+
+function check() {
+	local require_tool=$1
+
+	if ! command -v "$require_tool" >/dev/null 2>&1; then 
+		echo "Could not find $require_tool in system"
+		exit
+	fi 
+}
+
+function fmt() {
+	local clang_fmt="clang-format"
+	check "$clang_fmt"
+	local tools_dir="tools"
+	local clang_fmt_cfg=".clang-format"
+
+	if [[ "$tools_dir" == "$current_dir" ]]; then 
+		cd .. || exit 1
+	fi 
+
+	if [ ! -f "$clang_fmt_cfg" ]; then
+		echo "$clang_fmt_cfg not found"
+		exit 1
+	fi 
+
+	find . -name "*.cxx" -o -name "*.hxx" | while IFS= read -r file; do
+		file_base_name=$(basename "$file")
+
+		echo -e "\e[0;32m[+] Format file: $file_base_name\e[0;37m"
+		"$clang_fmt" -style=file "$clang_fmt_cfg" "$file" >/dev/null
+	done 
+}
+
+function main() {
+	fmt 
+}
+
+main
\ No newline at end of file