How to patch koe_1.2.diff to your server? Am I doing it right?

[Hale]

rAthena
Pre-Renewal
2015 Client

Good day! I downloaded sa script for King of Hill at AnnieRuRu's content. The script works but the problem is, even tho I'm the owner of the Emperium, I can still hit the Emperium itself.

I saw one post recently that you need to patch your server using the koe_1.2.diff file/patch file for rAthena. But I can't seem to find tutorials online on how to do it

What I did earlier was to upload the diff file into the root folder of my server using WinSCP (shown in the first image below) and then I did the git apply using terminal in my server using VNCviewer and it has error (shown in the second image below). I really don't have the slightest idea on how to do this the correct way.

I hope you could help me asap. Thanks a lot!
 

Here's the patch content I got from AnnieRuRu's most update KOE Files and Patch

// ===== rAthena Patch ========================================
// = King of Emperium Hill
// ===== By: ==================================================
// = AnnieRuru
// ===== Current Version: =====================================
// = 1.2
// ===== Compatible With: ===================================== 
// = rAthena 2018-04-08
// ===== Description: =========================================
// = stop guild owner from hitting the emperium over and over
// ===== Topic ================================================
// = http://herc.ws/board/topic/4495-king-of-emperium-hill/
// ===== Additional Comments: =================================  
// = finally a patch for this popular script
// ============================================================

 db/castle_db.txt   | 2 ++
 src/map/battle.cpp | 7 +++++++
 src/map/battle.hpp | 1 +
 3 files changed, 10 insertions(+)

diff --git a/db/castle_db.txt b/db/castle_db.txt
index ceb74dd..0fc8231 100644
--- a/db/castle_db.txt
+++ b/db/castle_db.txt
@@ -60,3 +60,5 @@
 41,te_prtcas03,Gloria 3,Manager_TE#Wigner
 42,te_prtcas04,Gloria 4,Manager_TE#Heine
 43,te_prtcas05,Gloria 5,Manager_TE#Nerious
+
+100,guild_vs1,King of Emperium Hill,koe
\ No newline at end of file
diff --git a/src/map/battle.cpp b/src/map/battle.cpp
index e845c5e..4234ba7 100644
--- a/src/map/battle.cpp
+++ b/src/map/battle.cpp
@@ -7643,6 +7643,13 @@ int battle_check_target( struct block_list *src, struct block_list *target,int f
 	if( (s_bl = battle_get_master(src)) == NULL )
 		s_bl = src;
 
+	if ( s_bl->type == BL_PC && t_bl->type == BL_MOB ) {
+		struct map_session_data *sd = BL_CAST( BL_PC, s_bl );
+		if ( ( ( (TBL_MOB*)target )->mob_id == 1288 && !strcmp( mapindex_id2name(sd->mapindex), "guild_vs1" ) ) &&
+			( sd->status.guild_id == mapreg_readreg( add_str("$koegid") ) || battle_getcurrentskill(src) > 0 ) )
+		return 0;
+	}
+
 	if ( s_bl->type == BL_PC ) {
 		switch( t_bl->type ) {
 			case BL_MOB: // Source => PC, Target => MOB
diff --git a/src/map/battle.hpp b/src/map/battle.hpp
index b5fe7d4..f8e8908 100644
--- a/src/map/battle.hpp
+++ b/src/map/battle.hpp
@@ -10,6 +10,7 @@
 #include "../config/core.h"
 
 #include "map.hpp" //ELE_MAX
+#include "mapreg.hpp"
 
 //fwd declaration
 struct map_session_data;