diff --git a/bidirectional_pathtracing.h b/bidirectional_pathtracing.h
index 119a60f..d775baf 100644
--- a/bidirectional_pathtracing.h
+++ b/bidirectional_pathtracing.h
@@ -1,4 +1,4 @@
-#ifndef _BIDIRECTIONAL_PATHTRACING_H_
+#ifndef _BIDIRECTIONAL_PATHTRACING_H_
 #define _BIDIRECTIONAL_PATHTRACING_H_
 
 #include "hdr.h"
diff --git a/camera.h b/camera.h
index 24dafdf..8076a80 100644
--- a/camera.h
+++ b/camera.h
@@ -1,4 +1,4 @@
-#ifndef _CAMERA_H_
+#ifndef _CAMERA_H_
 #define _CAMERA_H_
 
 namespace edubpt {
diff --git a/constant.h b/constant.h
index d418acc..46e267c 100644
--- a/constant.h
+++ b/constant.h
@@ -1,4 +1,4 @@
-#ifndef _CONSTANT_H_
+#ifndef _CONSTANT_H_
 #define _CONSTANT_H_
 
 namespace edubpt {
diff --git a/hdr.h b/hdr.h
index 2924b33..49ba59d 100644
--- a/hdr.h
+++ b/hdr.h
@@ -1,4 +1,4 @@
-#ifndef _HDR_H_
+#ifndef _HDR_H_
 #define _HDR_H_
 
 #include <algorithm>
diff --git a/intersection.h b/intersection.h
index d93abb4..b51f19a 100644
--- a/intersection.h
+++ b/intersection.h
@@ -1,4 +1,4 @@
-#ifndef _INTERSECTION_H_
+#ifndef _INTERSECTION_H_
 #define _INTERSECTION_H_
 
 #include "vec.h"
diff --git a/lighttracing.h b/lighttracing.h
index 36e99e7..dbfb2eb 100644
--- a/lighttracing.h
+++ b/lighttracing.h
@@ -1,4 +1,4 @@
-#ifndef _LIGHTTRACING_H_
+#ifndef _LIGHTTRACING_H_
 #define _LIGHTTRACING_H_
 
 #include "hdr.h"
diff --git a/main.cpp b/main.cpp
index d7b6ec7..b0b1bff 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,4 +1,4 @@
-
+
 #include "hdr.h"
 #include "random.h"
 #include "scene.h"
diff --git a/material.h b/material.h
index 8105d54..35a8f0e 100644
--- a/material.h
+++ b/material.h
@@ -1,4 +1,4 @@
-#ifndef _MATERIAL_H_
+#ifndef _MATERIAL_H_
 #define _MATERIAL_H_
 
 #include "vec.h"
diff --git a/pathtracing.h b/pathtracing.h
index b46b755..5ac2cee 100644
--- a/pathtracing.h
+++ b/pathtracing.h
@@ -1,4 +1,4 @@
-#ifndef _PATHTRACING_H_
+#ifndef _PATHTRACING_H_
 #define _PATHTRACING_H_
 
 #include "hdr.h"
diff --git a/random.h b/random.h
index 1ed11ab..b933784 100644
--- a/random.h
+++ b/random.h
@@ -1,4 +1,4 @@
-#ifndef _RANDOM_H_
+#ifndef _RANDOM_H_
 #define _RANDOM_H_
 
 #include <climits>
diff --git a/ray.h b/ray.h
index 813e9cd..12c2ae4 100644
--- a/ray.h
+++ b/ray.h
@@ -1,4 +1,4 @@
-#ifndef _RAY_H_
+#ifndef _RAY_H_
 #define _RAY_H_
 
 #include "vec.h"
diff --git a/reference_pathtracing.h b/reference_pathtracing.h
index c5f807d..7b88997 100644
--- a/reference_pathtracing.h
+++ b/reference_pathtracing.h
@@ -1,4 +1,4 @@
-#ifndef _REFERENCE_PATHTRACING_
+#ifndef _REFERENCE_PATHTRACING_
 #define _REFERENCE_PATHTRACING_
 
 #include "hdr.h"
diff --git a/sampling.h b/sampling.h
index 91e8f26..b7c6156 100644
--- a/sampling.h
+++ b/sampling.h
@@ -1,4 +1,4 @@
-#ifndef _SAMPLING_H_
+#ifndef _SAMPLING_H_
 #define _SAMPLING_H_
 
 namespace edubpt {
diff --git a/scene.h b/scene.h
index 08a558d..90f9085 100644
--- a/scene.h
+++ b/scene.h
@@ -1,4 +1,4 @@
-#ifndef	_SCENE_H_
+#ifndef	_SCENE_H_
 #define	_SCENE_H_
 
 #include "constant.h"
diff --git a/specular.h b/specular.h
index f5b1e7c..1f32ae5 100644
--- a/specular.h
+++ b/specular.h
@@ -1,4 +1,4 @@
-#ifndef _SPECULAR_H_
+#ifndef _SPECULAR_H_
 #define _SPECULAR_H_
 
 #include "material.h"
diff --git a/sphere.h b/sphere.h
index e58b35e..c747af2 100644
--- a/sphere.h
+++ b/sphere.h
@@ -1,4 +1,4 @@
-#ifndef	_SPHERE_H_
+#ifndef	_SPHERE_H_
 #define	_SPHERE_H_
 
 #include <cmath>
diff --git a/util.h b/util.h
index 3733880..7b740ea 100644
--- a/util.h
+++ b/util.h
@@ -1,4 +1,4 @@
-#ifndef _UTIL_H_
+#ifndef _UTIL_H_
 #define _UTIL_H_
 
 #include "constant.h"
diff --git a/vec.h b/vec.h
index 51dbd3c..6645e56 100644
--- a/vec.h
+++ b/vec.h
@@ -1,4 +1,4 @@
-#ifndef	_VEC_H_
+#ifndef	_VEC_H_
 #define	_VEC_H_
 
 #include <cmath>
diff --git a/vertex.h b/vertex.h
index eb9c027..05ef872 100644
--- a/vertex.h
+++ b/vertex.h
@@ -1,4 +1,4 @@
-#ifndef _VERTEX_H_
+#ifndef _VERTEX_H_
 #define _VERTEX_H_
 
 #include "vec.h"