thanks for the comment i actually really appreciate it. I actually realised the +-3 wouldn't work in all cases but I lazily didn't fix it 😂 but the first two points are good tips

Nice solution. I would probably prefer to see a foreach loop - personally I find them easier to read:

forach(var move in walk) {
  if (move.Equals("n")) {...}
  // etc.
}

I like that you check the length first: many solutions check it at the end which is a little inefficient I think.