private void Spawn()
{
ICallOnDestroy newInstance = Instantiate(prefab, GetSpawnPosition(), Quaternion.identity, transform).GetComponent <ICallOnDestroy>();
spawned.Add(newInstance);
newInstance?.SetupCallOnDestroy(() => RemoveSpawned(newInstance));
}
private void RemoveSpawned(ICallOnDestroy toRemove) => spawned.Remove(toRemove);
