How were you storing direction? Was it a symbol for one of NORTH, EAST, SOUTH, WEST, or a symbol for one of FORWARD, LEFT, RIGHT, or a pair of values for row direction and column direction (i.e. +1, 0 or -1, 0 or 0, +1, or 0, -1)?
I know I had issues keeping track of how many steps I’d taken, but making sure I was generating a good set of neighbours helped with that.
Otherwise it was just making sure I got the rules right, like all AoC problems, and testing different cases to make sure my solution did the right thing.
