opt: optimize code struct

src/fetch/client.h

@@ -335,3 +335,19 @@ focustop(Monitor *m) {
 	}
 	return NULL;
 }
+
+Client *get_next_stack_client(Client *c, bool reverse) {
+	Client *next = NULL;
+	if (reverse) {
+		wl_list_for_each_reverse(next, &c->link, link) {
+			if (VISIBLEON(next, c->mon) && next != c)
+				return next;
+		}
+	} else {
+		wl_list_for_each(next, &c->link, link) {
+			if (VISIBLEON(next, c->mon) && next != c)
+				return next;
+		}
+	}
+	return NULL;
+}