void Awake()
 {
     if (instance != null)
     {
         Debug.LogWarning("More than 1 instance of Spell_Bar_UI");
         return;
     }
     instance = this;
 }
 // Use this for initialization
 void Start()
 {
     spellBar        = Spell_Bar.instance;
     gameManager     = GameManager.instance;
     playerInfo      = Player_Information.instance;
     spellUI         = Spell_Bar_UI.instance;
     enemyList       = GameObject.FindGameObjectsWithTag("Enemy");
     walkableTilemap = gameManager.walkableTilemap;
     wallTilemap     = gameManager.wallTilemap;
 }