private void SpawnRandomResource(Transform pos)
    {
        float v = Random.value;

        Collectable newCollectable;

        if (v > 0.1f)
        {
            newCollectable = Collectable.CreateAmmo();
        }
        else if (v > 0.05f)
        {
            newCollectable = Collectable.CreateBomb();
        }
        else
        {
            newCollectable = Collectable.CreateShield();
        }

        newCollectable.gameObject.transform.position = pos.position;
    }