1. Prologue

You are a simple memory guardian, trained by a very basic garbage collector. Your task is always the same: free the cells whose owners have no work left. Today you have been assigned a new space, a range of addresses deep inside the RAM.

Everything goes well, as usual, until suddenly you fix your gaze on an anomaly you have never seen before. There is an asterisk trapped between 99 pairs of parentheses!

It is trying to get your attention by jumping around. You decide to get closer and, seeing it up close, you realize it is actually a Greek letter, specifically a lambda (λ), that has been trapped by a routine. Luckily you had a hearty breakfast, because today is going to be a long day.

It seems the only way to free it is by solving the 99 problems using Common Lisp.