void Awake()
 {
     if (instance != null)
     {
         Debug.LogError("More than one BuildingShopManager in scene !"); return;
     }
     instance = this;
 }
 private void Awake()
 {
     if (Instance == null)
     {
         Instance = this;
     }
     else
     {
         Debug.LogError("Too many instances!");
         Destroy(gameObject);
     }
 }