exp 7: remove the peek fn

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

7.c

@@ -13,8 +13,6 @@ struct Queue {
   node *tail;
 };
 
-int peek(queue *q) { return q->head->id; }
-
 void insert(queue *q, int id) {
   node *new = malloc(sizeof(node));
   new->id = id;