diff --git a/game.c b/game.c
index 7c96b9f..08d1210 100644
--- a/game.c
+++ b/game.c
@@ -88,122 +88,6 @@ int createCar(){
   return 0;
 }
 
-int mainv1(void){
-  if(init() != 0) return 1;
-
-  // create surface
-  surface = IMG_Load("img/car.png");
-  if(!surface){
-    printf("error create surface: %s\n", SDL_GetError());
-    SDL_DestroyRenderer(renderer);
-    SDL_DestroyWindow(window);
-    SDL_Quit();
-    return 3;
-  }
-
-  // create texture
-  texture = SDL_CreateTextureFromSurface(renderer, surface);
-  SDL_FreeSurface(surface);
-  if(!texture){
-    printf("error create texture: %s\n", SDL_GetError());
-    SDL_DestroyRenderer(renderer);
-    SDL_DestroyWindow(window);
-    SDL_Quit();
-    return 3;
-  }
-
-  // car
-  SDL_Rect car;
-  SDL_QueryTexture(texture, NULL, NULL, &car.w, &car.h);
-
-  car.x = (WINDOW_WIDTH - car.w) / 2;
-  car.y = (WINDOW_HEIGHT- car.h) / 2;
-
-  Uint8 close_requested = 0;
-  int car_moving = 0;
-  int direction = 0;
-
-  double heading = PI;
-  double speed = SPEED / FPS;
-
-  while(!close_requested){
-    // process events
-    SDL_Event event;
-    while (SDL_PollEvent(&event)){
-      switch (event.type) {
-        case SDL_QUIT:
-          close_requested = 1;
-          break;
-        case SDL_KEYDOWN:
-          switch (event.key.keysym.scancode) {
-            case SDL_SCANCODE_UP:
-            case SDL_SCANCODE_W:
-              car_moving = 1;
-              break;
-            case SDL_SCANCODE_DOWN:
-            case SDL_SCANCODE_S:
-              car_moving = -1;
-              break;
-            case SDL_SCANCODE_LEFT:
-            case SDL_SCANCODE_A:
-              direction = 1;
-              break;
-            case SDL_SCANCODE_RIGHT:
-            case SDL_SCANCODE_D:
-              direction = -1;
-            default:
-              break;
-          }
-          break;
-        case SDL_KEYUP:
-          switch (event.key.keysym.scancode) {
-            case SDL_SCANCODE_UP:
-            case SDL_SCANCODE_W:
-            case SDL_SCANCODE_DOWN:
-            case SDL_SCANCODE_S:
-              car_moving = 0;
-              break;
-            case SDL_SCANCODE_LEFT:
-            case SDL_SCANCODE_A:
-            case SDL_SCANCODE_RIGHT:
-            case SDL_SCANCODE_D:
-              direction = 0;
-            default:
-              break;
-          }
-        default:
-          break;
-      }
-    }
-
-    // clear the window
-    SDL_RenderClear(renderer);
-
-    // update position
-    if(car_moving == 1){
-      car.x += (int) (sin(heading)*speed);
-      car.y += (int) (cos(heading)*speed);
-    }else if(car_moving == -1){
-      car.x -= (int) (sin(heading)*speed);
-      car.y -= (int) (cos(heading)*speed);
-    }
-
-    // drow image
-    SDL_RenderCopy(renderer, texture, NULL, &car);
-    SDL_RenderPresent(renderer);
-
-    // wait
-    SDL_Delay(1000 / FPS);
-  }
-
-  // clean up resources before exiting
-  SDL_DestroyTexture(texture);
-  SDL_DestroyRenderer(renderer);
-  SDL_DestroyWindow(window);
-  SDL_Quit();
-  return 0;
-}
-
 int main(void){
   if(init() != 0) return 1;
   if(createCar() != 0) return 2;
@@ -275,15 +159,20 @@ int main(void){
     SDL_RenderClear(renderer);
 
     // update position
-    if(direction == 1){
-      heading += sspeed;
-    }else if(direction == -1){
-      heading -= sspeed;
-    }
     if(car_moving == 1){
+      if(direction == 1){
+        heading += sspeed;
+      }else if(direction == -1){
+        heading -= sspeed;
+      }
       car_pos[0] += (sin(heading)*speed);
       car_pos[1] += (cos(heading)*speed);
     }else if(car_moving == -1){
+      if(direction == 1){
+        heading -= sspeed;
+      }else if(direction == -1){
+        heading += sspeed;
+      }
       car_pos[0] -= (sin(heading)*speed);
       car_pos[1] -= (cos(heading)*speed);
     }