From 6a1da40b09fb7292c6b69ed6c34b9161dd911dff Mon Sep 17 00:00:00 2001
From: Aster Seker <git.electroyar@gmail.com>
Date: Thu, 4 Sep 2025 02:18:57 +0300
Subject: [PATCH] fix(mql): trim trailing null in to_hex

Remove null terminator inserted by StringToCharArray to avoid stray 00 in hex output.
---
 hmac.mqh | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hmac.mqh b/hmac.mqh
index 6d1c3ec..66328d9 100644
--- a/hmac.mqh
+++ b/hmac.mqh
@@ -54,6 +54,9 @@ namespace hmac {
     string to_hex(const string& str, bool is_upper = false) {
         uchar bytes[];
         StringToCharArray(str, bytes, 0, -1, CP_UTF8);
+        int len = ArraySize(bytes);
+        if (len > 0 && bytes[len - 1] == '\0') len -= 1;
+        ArrayResize(bytes, len);
         return to_hex(bytes, is_upper);
     }