added absolutely broken cpp code after painfull debugging session

src/core/Engine.cpp

@@ -0,0 +1,41 @@
+#include "Engine.h"
+#include <iostream>
+#include <SDL3/SDL.h>
+#include "WindowManager.h"
+
+bool running = true;
+WindowManager wm;
+
+bool Engine::Init() {
+	if (!SDL_Init(SDL_INIT_VIDEO)) {
+		std::cerr << "SDL_Init failed: " << SDL_GetError() << "\n";
+		return false;
+	}
+
+	wm = new WindowManager();
+
+	if (!wm.InitWindow("ShadowCrest", 800, 600)) {
+		std::cerr << "SDL_Init failed: " << SDL_GetError() << "\n";
+		return false;
+	}
+
+	return true;
+}
+
+void Engine::Run() {
+	SDL_Event event;
+	while (running) {
+		while (SDL_PollEvent(&event)) {
+			if (event.type == SDL_EVENT_QUIT) {
+				running = false;
+			}
+		}
+
+		SDL_Delay(16);
+	}
+}
+
+void Engine::Shutdown() {
+	SDL_DestroyWindow(window);
+	SDL_Quit();
+}

src/core/Engine.h

@@ -0,0 +1,8 @@
+#pragma once
+
+class Engine {
+public:
+	bool Init();
+	void Run();
+	void Shutdown();
+};

src/core/WindowManager.cpp

@@ -0,0 +1,12 @@
+#include "WindowManager.h"
+#include <iostream>
+#include <SDL3/SDL.h>
+#include <Windows.h>
+
+SDL_Window* window = nullptr;
+
+bool WindowManager::InitWindow(char *name, int width, int height) {
+	// creates window
+	window = SDL_CreateWindow(name, width, height, SDL_WINDOW_RESIZABLE);
+	return window != nullptr;
+}

src/core/WindowManager.h

@@ -0,0 +1,10 @@
+#include <string>
+using namespace std;
+
+#pragma once
+
+class WindowManager {
+public:
+	bool InitWindow(char *name, int width, int height);
+	void Draw();
+};