separate folders per functionality

TanksServer/GameLogic/BulletManager.cs

@@ -0,0 +1,15 @@
+namespace TanksServer.GameLogic;
+
+internal sealed class BulletManager
+{
+    private readonly HashSet<Bullet> _bullets = new();
+
+    public void Spawn(Bullet bullet) => _bullets.Add(bullet);
+
+    public IEnumerable<Bullet> GetAll() => _bullets;
+
+    public void RemoveWhere(Predicate<Bullet> predicate)
+    {
+        _bullets.RemoveWhere(predicate);
+    }
+}