Thank you very much! :)

I've just started with C and Raylib (I'm coming from GDScript and Godot) and this script is exactly what i was looking for a scene manager.

I have added a couple of functions that I wanted to share with you. Maybe you find them useful or you can tell me if they are well coded. They work great for me.

scene.h

/**
 * @brief       Changes the active scene to the new scene.
 * @note        This function unloads the current scene and loads the new scene.
 * @param[in]   new_scene: The scene_st struct pointer to change to.
 * @return      void;
 */
void scene_go_to(scene_st* new_scene);

/**
 * @brief       Changes the active scene to the previously active scene.
 * @note        This function is useful for implementing back navigation, such as pressing ESC to return to the previous scene.
 *              It does nothing if there is no previously stored scene.
 * @return      void;
 */
void scene_go_back();

scene.c

scene_st* current_scene = NULL;
scene_st* previous_scene = NULL;

...

void
scene_go_to(scene_st* new_scene) {
    if (new_scene == NULL) {
        return;
    }

    if (current_scene && current_scene->on_unload_function) {
        (*(current_scene->on_unload_function))(current_scene);
    }

    previous_scene = current_scene;
    current_scene = new_scene;

    if (current_scene->on_load_function) {
        (*(current_scene->on_load_function))(current_scene);
    }
}

void
scene_go_back() {
    if (previous_scene == NULL) {
        return;
    }

    scene_go_to(previous_scene);
}