Duplicating items with any furnaces

This works for furnace, smoker and blast furnace
1.Touch 1 time on baked potato with furnace
2.Use the D-Pad on an enchanted golden apple after pressing 2 times on A
3.Press B
4.Use ZL on furnace
5.Touch 1 time on enchanted golden apple with furnace
6.Press 2 times for baked potato
7.Receive extra enchanted golden apple with furnace

I don't know how it works with other devices (Android)