Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|From 671cd00f679247378af4ec1813e071985f2bab72 Mon Sep 17 00:00:00 2001
|From: mzeinali <mzeinali@protonmail.com>
|Date: Fri, 15 Oct 2021 02:41:50 +0330
|Subject: [PATCH] single tagset for dwm source a786211 20211015
|
|---
| dwm.c | 226 ++++++++++++++++++++++++++++++++++++++++++++--------------
| 1 file changed, 171 insertions(+), 55 deletions(-)
|
|diff --git a/dwm.c b/dwm.c
|index 5e4d494..5eb3d5f 100644
|--- a/dwm.c
|+++ b/dwm.c
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 49.
Hunk #2 succeeded at 82.
Hunk #3 succeeded at 125.
Hunk #4 succeeded at 141.
Hunk #5 succeeded at 190.
Hunk #6 succeeded at 274.
Hunk #7 succeeded at 307.
Hunk #8 succeeded at 389.
Hunk #9 succeeded at 410.
Hunk #10 succeeded at 519.
Hunk #11 succeeded at 606.
Hunk #12 succeeded at 652.
Hunk #13 succeeded at 672.
Hunk #14 succeeded at 722.
Hunk #15 succeeded at 731.
Hunk #16 succeeded at 771.
Hunk #17 succeeded at 846.
Hunk #18 succeeded at 900.
Hunk #19 succeeded at 1169.
Hunk #20 succeeded at 1256.
Hunk #21 succeeded at 1422.
Hunk #22 succeeded at 1476.
Hunk #23 succeeded at 1601.
Hunk #24 succeeded at 1678.
Hunk #25 succeeded at 1718.
Hunk #26 succeeded at 1755.
Hunk #27 succeeded at 1763.
Hunk #28 succeeded at 1803.
Hunk #29 succeeded at 1823.
Hunk #30 succeeded at 1942.
Hunk #31 succeeded at 1972.
Hunk #32 succeeded at 1995.
Hunk #33 succeeded at 2135.
Hunk #34 succeeded at 2170.
Hunk #35 succeeded at 2237.
Hmm...  Ignoring the trailing garbage.
done