Poorly I surmise from the result. There were some obvious missteps in the implementation, calling a function that locks inside another function that locks. Locking and then performing an early return. I noticed a fencepost error in the pointer arithmetic applying modulo and then iterating. But I was flustered partly because I hadn't seen the problem before in any prep material, and also because I was having many network troubles which were booting me from the codepair page. Eventually I ran out of time.