Fixing include guards.

entity.hh

@@ -3,8 +3,6 @@
 
 #include <ACGL/Math/Math.hh>
 
-#endif
-
 class Entity {
     public:
         Entity(glm::vec3 position, glm::vec3 rotation);
@@ -17,3 +15,5 @@ class Entity {
         glm::vec3 position;
         glm::vec3 rotation;
 };
+
+#endif

level.hh

@@ -4,8 +4,6 @@
 #include <string>
 #include "entity.hh"
 
-#endif
-
 class Level {
     public:
         Level(std::string filePath);
@@ -15,3 +13,5 @@ class Level {
         std::string filePath;
         std::vector<Entity> entities;
 };
+
+#endif

physics.hh

@@ -1,2 +1,4 @@
+#ifndef PHYSICS_HH_INCLUDED
+#define PHYSICS_HH_INCLUDED
 
-
+#endif