## Finding the walls to follow

This is exactly the same maze than before, but the buggle does not start at the same location. In particular, it does not have any wall to its left at the beginning.

As a result, the method you wrote for the previous exercise probably don't work for this one. If you use it here with no modification, your buggle probably start looping over the four free cells around its start position (if that's not the case, well, you didn't really stick to the mission on previous exercise. Feel lucky and proceed to the next :)

This is because your `keepHandOnSideWall()` method has an implicit pre-condition: it works well if and only if the buggle has a wall to its left when you call it. Such pre-condition are very heavily used when programming. Specifying them explicitly helps understanding the code written by other, and they even allow sometimes to prove that the code works correctly.

### Exercise goal

Fixing the problem should be very easy. Simply make sure that the pre-condition of `keepHandOnSideWall()` is verified before calling it. For that, update your code to first look for a wall on its left before the big `while` loop.