Modified the ObjectStore and the Hashmap and added the ObjectStore to

the GameManager

src/Window.c

@@ -49,9 +49,14 @@ void fill_window_with_color(const Window *wnd, SDL_Color color) {
 void swap_render_buffers(const Window *wnd) { swap_buffers(wnd->renderer); }
 
 void destroy_window(Window *wnd) {
+  if (!wnd) {
+    return;
+  }
+
   if (wnd->SDL_base_window) {
     if (wnd->renderer) {
       destroy_renderer(wnd->renderer);
+      wnd->renderer = NULL;
     }
 
     SDL_DestroyWindow(wnd->SDL_base_window);