practical_work/planets/skeleton/planet/planet.c → practical_work/planets/skeleton/planet/celestial_body.c

-#include "planet.h"
+#include "celestial_body.h"
 #include <stdlib.h>
 
 #define G 6.67e-11

practical_work/planets/skeleton/planet/planet.h → practical_work/planets/skeleton/planet/celestial_body.h

-#ifndef _PLANET_H_
-#define _PLANET_H_
+#ifndef _CELESTIAL_BODY_H_
+#define _CELESTIAL_BODY_H_
 
 #include "../vec2/vec2.h"
 #include "../gfx/gfx.h"
@@ -20,7 +20,7 @@ typedef struct _system
 
 // Those function are not mandatory to implement,
 // it's rather a hint of what you should have.
-celestial_body_t create_planet(double mass, vec2 pos);
+celestial_body_t create_celestial_body(double mass, vec2 pos);
 system_t create_system(double delta_t);
 void show_system(struct gfx_context_t *ctxt, system_t *system);
 void update_system(system_t *system, double delta_t);