private static void dropBallsToSystem(int depth, int ballCount, ISystemService systemService, IBallService ballService)
{
var system = systemService.CreateSystem(depth);
for (var i = 0; i < ballCount; i++)
{
var ball = ballService.CreateBall(i);
systemService.AddBallToSystem(ball, system);
}
var emptyContainers = systemService.GetEmptyContainers(system);
Console.WriteLine("Empty Container Names:" + string.Join(",", emptyContainers.Select(p => p.Name).ToArray()));
}