refactor(link_filter): 优化链接过滤器中的链接标准化函数，修复关键词处理逻辑

src/guard.py

@@ -67,7 +67,7 @@ async def process_message(event, client):
             logger.info(f"Message should be filtered: {event.message.text}")
             if event.sender_id != ADMIN_ID:
                 await event.delete()
-                notification = await event.respond("已撤回该消息。注:包含关键词或重复发送的非白名单链接会被自动撤回。")
+                notification = await event.respond("已撤回该消息。注:已置顶项目分享链接, 二次分享链接, 都会被撤回.")
                 asyncio.create_task(delete_message_after_delay(client, event.chat_id, notification, 3 * 60))
             return
         if new_links:

src/link_filter.py

@@ -108,6 +108,7 @@ class LinkFilter:
         new_non_whitelisted_links = []
         for link in links:
             normalized_link = self.normalize_link(link)
+            normalized_link = normalized_link.lstrip('/')  # 去除开头的双斜杠
             if not self.is_whitelisted(normalized_link):
                 logger.debug(f"Link not whitelisted: {normalized_link}")
                 if normalized_link not in self.keywords:
@@ -120,6 +121,7 @@ class LinkFilter:
         if new_non_whitelisted_links:
             logger.info(f"New non-whitelisted links found: {new_non_whitelisted_links}")
         return False, new_non_whitelisted_links
+
     
     async def handle_keyword_command(self, event, command, args):
         if command == '/list':