Add deduplication of strings in link rewriting process in main.go to ensure unique links are returned, enhancing link handling efficiency.

main.go

@@ -389,6 +389,22 @@ func hasAnyLinks(links userLinks) bool {
 // serverParamRe matches server=... in tg://proxy URLs
 var serverParamRe = regexp.MustCompile(`server=[^&]+`)
 
+func deduplicateStrings(items []string) []string {
+	if len(items) <= 1 {
+		return items
+	}
+	seen := make(map[string]struct{}, len(items))
+	out := make([]string, 0, len(items))
+	for _, s := range items {
+		if _, ok := seen[s]; ok {
+			continue
+		}
+		seen[s] = struct{}{}
+		out = append(out, s)
+	}
+	return out
+}
+
 func (b *bot) rewriteLinksWithHost(links userLinks) userLinks {
 	host := strings.TrimSpace(b.cfg.TelemtLinkHost)
 	if host == "" {
@@ -403,7 +419,7 @@ func (b *bot) rewriteLinksWithHost(links userLinks) userLinks {
 		for i, s := range items {
 			out[i] = serverParamRe.ReplaceAllString(s, replacement)
 		}
-		return out
+		return deduplicateStrings(out)
 	}
 	return userLinks{
 		Classic: rewrite(links.Classic),