From 0cbe285d54f311fca4c035587233d981ec9b41fe Mon Sep 17 00:00:00 2001
From: Jacopo De Simoi <wilderjds@protonmail.com>
Date: Thu, 18 Sep 2025 14:44:55 -0400
Subject: [PATCH] Add char-at to library

---
 lib/lib-advent.org | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/lib-advent.org b/lib/lib-advent.org
index 3ee51f1..62ce6af 100644
--- a/lib/lib-advent.org
+++ b/lib/lib-advent.org
@@ -20,6 +20,12 @@
       (--map (string-to-char it) (split-string str "\\|.+" t)))
   #+end_src
 
+  #+begin_src emacs-lisp
+      (defun advent/char-at (p l)
+        "return the char at position P in the 2D list l"
+    (nth (car p) (nth (cadr p) l)))
+  #+end_src
+
   #+begin_src emacs-lisp
     (defun advent/coordinates-of (e li)
       "This takes a 2D list (a list of lists) of chars LI and an element E