From d08f4afbdb11c5f88f5d239eba086b57eb3e703e Mon Sep 17 00:00:00 2001
From: CZECHIA-COM <github@czechia.com>
Date: Mon, 23 Feb 2026 11:06:46 +0100
Subject: [PATCH] Update dns_czechia.sh

Refactor: use _lower_case() helper
---
 dnsapi/dns_czechia.sh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dnsapi/dns_czechia.sh b/dnsapi/dns_czechia.sh
index 7867f14b..1485a014 100644
--- a/dnsapi/dns_czechia.sh
+++ b/dnsapi/dns_czechia.sh
@@ -113,10 +113,13 @@ _czechia_norm_zonelist() {
   # - trimmed
   # - trailing dots removed
   # - empty entries dropped
+
   in="$1"
   [ -z "$in" ] && return 0
+
+  in="$(_lower_case "$in")"
+
   printf "%s" "$in" |
-    tr '[:upper:]' '[:lower:]' |
     tr ' ' ',' |
     tr -s ',' |
     sed 's/[\t\r\n]//g; s/\.$//; s/^,//; s/,$//; s/,,*/,/g'