public void Tick()
 {
     if (unit.resourceTarget != null)
     {
         if (nextHarvest <= (Time.time + harvestSpeed))
         {
             int takeResult, surplus;
             if (unit.inventory.CanAdd(unit.resourceItem))                 //redundant?
             {
                 if (target.GetRescource(harvestStrength, out takeResult)) //if target has resources; do damage to target and out itemsget
                 {
                     surplus        = unit.inventory.AddItem(unit.resourceItem, takeResult);
                     unit.storeItem = unit.resourceItem;
                     if (surplus > 0)
                     {
                         unit.DropResource(unit.resourceItem, surplus);
                     }
                 }
                 else //target is empty
                 {
                     unit.resourceTarget = null;
                 }
             }
             nextHarvest += harvestSpeed;
         }
     }
 }