don't let the player use multiple tokens at once

src/main/java/lol/hyper/toolstats/events/AnvilEvent.java

@@ -75,6 +75,11 @@ public class AnvilEvent implements Listener {
             return;
         }
 
+        // don't let the player use more than one
+        if (secondSlot.getAmount() > 1) {
+            return;
+        }
+
         // clone the item
         ItemStack clone = firstSlot.clone();