diff --git a/turtlebot4_gz_bringup/launch/sim.launch.py b/turtlebot4_gz_bringup/launch/sim.launch.py
index 0b8c848..7b4c665 100644
--- a/turtlebot4_gz_bringup/launch/sim.launch.py
+++ b/turtlebot4_gz_bringup/launch/sim.launch.py
@@ -58,7 +58,7 @@ def generate_launch_description():
     pkg_ros_gz_sim = get_package_share_directory(
         'ros_gz_sim')
 
-     # Set Gazebo resource path
+    # Set Gazebo resource path
     gz_resource_path = SetEnvironmentVariable(
         name='GZ_SIM_RESOURCE_PATH',
         value=':'.join([
@@ -71,7 +71,7 @@ def generate_launch_description():
 
     gz_gui_plugin_path = SetEnvironmentVariable(
         name='GZ_GUI_PLUGIN_PATH',
-        value=":".join([
+        value=':'.join([
             os.path.join(pkg_turtlebot4_gz_gui_plugins, 'lib'),
             os.path.join(pkg_irobot_create_gz_plugins, 'lib')
         ])
@@ -85,15 +85,18 @@ def generate_launch_description():
     gazebo = IncludeLaunchDescription(
         PythonLaunchDescriptionSource([gz_sim_launch]),
         launch_arguments=[
-            ('gz_args', [LaunchConfiguration('world'),
-                          '.sdf',
-                          ' -v 4',
-                          ' --gui-config ',
-                          PathJoinSubstitution(
-                            [pkg_turtlebot4_gz_bringup,
-                             'gui',
-                             LaunchConfiguration('model'),
-                             'gui.config'])])
+            ('gz_args', [
+                LaunchConfiguration('world'),
+                '.sdf',
+                ' -v 4',
+                ' --gui-config ',
+                PathJoinSubstitution([
+                    pkg_turtlebot4_gz_bringup,
+                    'gui',
+                    LaunchConfiguration('model'),
+                    'gui.config'
+                ])
+            ])
         ]
     )
 
diff --git a/turtlebot4_gz_gui_plugins/Turtlebot4Hmi/Turtlebot4Hmi.hh b/turtlebot4_gz_gui_plugins/Turtlebot4Hmi/Turtlebot4Hmi.hh
index e518995..b3ad5a0 100644
--- a/turtlebot4_gz_gui_plugins/Turtlebot4Hmi/Turtlebot4Hmi.hh
+++ b/turtlebot4_gz_gui_plugins/Turtlebot4Hmi/Turtlebot4Hmi.hh
@@ -20,12 +20,12 @@
 #define TURTLEBOT4_GZ_GUI_PLUGINS__TURTLEBOT4HMI__TURTLEBOT4HMI_HH_
 
 #include <gz/gui/qt.h>
-#include <gz/msgs.hh>
 
 #include <string>
 
-#include <gz/transport/Node.hh>
 #include <gz/gui/Plugin.hh>
+#include <gz/msgs.hh>
+#include <gz/transport/Node.hh>
 
 namespace gz
 {