From f4450abcf989ed7ce06a977c8c12483762f00512 Mon Sep 17 00:00:00 2001
From: "jan.nijtmans" <nijtmans@users.sourceforge.net>
Date: Mon, 6 Mar 2023 19:58:53 +0000
Subject: Proposed fix for [f3cb2a32d6]: uninitialized value in format-2.18

---
 generic/tclStringObj.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/generic/tclStringObj.c b/generic/tclStringObj.c
index 723d2e5..328e410 100644
--- a/generic/tclStringObj.c
+++ b/generic/tclStringObj.c
@@ -4849,6 +4849,7 @@ ExtendStringRepWithUnicode(
 
   copyBytes:
     dst = objPtr->bytes + origLength;
+    *dst = '\0';
     for (i = 0; i < numChars; i++) {
 	dst += Tcl_UniCharToUtf(unicode[i], dst);
     }
-- 
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