fix: remove '@' when linking as a URL

Author: ozbek

src/functions/groups.rs

@@ -120,7 +120,7 @@ pub fn keyboard_detail(page: i32, data: &Option<Group>) -> InlineKeyboardMarkup
 
     if let Some(group) = data {
         keyboard
-            .url("Telegram", &format!("https://t.me/{}", group.telegram))
+            .url("Telegram", &format!("https://t.me/{}", &group.telegram[1..]))
             .unwrap();
 
         if group.link.is_some() {