Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|From 449324adbe53240a734cb5f8f72763bb3419829a Mon Sep 17 00:00:00 2001
|From: Rizqi Nur Assyaufi <bandithijo@gmail.com>
|Date: Sat, 5 Aug 2021 00:04:32 +0800
|Subject: [PATCH] [sendmoncenter] Send floating window to another monitor will
| centered
|
|This patch will allows you to send floating window client to another monitor
|will be centered position.
|---
| dwm.c | 2 ++
| 1 file changed, 2 insertions(+)
|
|diff --git a/dwm.c b/dwm.c
|index 5e4d494..c20023e 100644
|--- a/dwm.c
|+++ b/dwm.c
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 1418.
Hmm...  Ignoring the trailing garbage.
done