A block interface procedure that subtracts three elements from the first cell and one element from the second cell.

Evening in the hut, so I created a procedure for the block interface in which if there are 4 gunpowder in 1 cell and 1 iron block in the second cell, these items are deleted and the n you can come up with anything with this procedure Sorry if I didn’t explain it well, I’m not a master at this, but I can help you implement your idea in this procedure