The Maze Backtracker

Explorers drop a breadcrumb at every step — back means eat the last breadcrumb and retreat. 🍞

You get moves — direction words (like north) or back (never past the start). Print the trail of moves still standing, comma-separated, or back at start.

Example:

Input: moves = ["north", "east", "back", "south"] Output: north,south

north and east get pushed as breadcrumbs. back pops east off, retreating one step. Then south gets pushed — leaving north,south.