indentation and comments

day10.rkt

@@ -11,7 +11,7 @@
       stack ; we've got an incomplete chunk. return the stack
       (let ([x (first input)] [xs (rest input)]) ; grab the first element of the input
         (if (member x opening) ; if it is an opening bracket
-            (go xs (cons x stack)) ; push it on the stack
+            (go xs (cons x stack)) ; push it on the stack and recurse
             (let* ([y (first stack)] ; otherwise, it's a closing bracket. grab the top of the stack..
                    [matching (second (assoc y pairs))]) ; and find its matching closing bracket
               (if (equal? matching x) ; if they match..