private void OnMouseDown()
 {
     if (EventSystem.current.IsPointerOverGameObject(-1) == true)
     {
         return;
     }
     if (EventSystem.current.IsPointerOverGameObject(0) == true)
     {
         return;
     }
     if (characterStat.canLevelUp(GameManager.instance.seed))
     {
         characterStat.incraselevel();
         GameManager.instance.seed -= characterStat.upgradeCost;
         GameManager.instance.updateText();
     }
 }