Never Pop an Empty Pile

The rookie robot keeps grabbing at an empty dispenser — teach it manners! 🤖

You get commands (add:x or take), but this time a take might arrive when the pile is empty. For each such doomed take, print empty! on its own line. At the end print how many plates remain.

Example:

Input: commands = ["take", "add:a", "take", "take"] Output:

empty!
empty!
0

The first take has nothing to grab (empty!). add:a puts one plate on, and the second take removes it fine. The third take finds the pile empty again (empty!) — leaving 0 plates.