Adding the ground to the GameObject rendering loop

main.dart

for (GameObject object in [...ground, ...obstacles, dino]) {
  children.add(
    AnimatedBuilder(
        animation: worldController,
        builder: (context, child) {
          Rect objectRect = object.getRect(screenSize, runDistance);
          return Positioned(
              top: objectRect.top,
              left: objectRect.left,
              width: objectRect.width,
              height: objectRect.height,
              child: object.render());
       }),
  );
}