@client.on(events.NewMessage(pattern=r",com ?(.*)", outgoing=True))
@client.on(events.MessageEdited(pattern=r",com ?(.*)", outgoing=True))
async def com(event):
   from telethon.tl.functions.messages import GetCommonChatsRequest
   from telethon.utils import get_display_name

   com_user = None

   if event.is_reply:
       com_user = (await event.get_reply_message()).from_id
   else:
       com_user = event.pattern_match.group(1)

   user_entity = await client.get_entity(com_user)
   user = get_display_name(user_entity)

   values = "\n".join(
       [
           f"[{chat.title}](tg://resolve?domain={chat.username}&post=1)"
           if chat.username
           else f"[{chat.title}](t.me/c/{chat.id}/1)"
           for chat in (await client(GetCommonChatsRequest(com_user, 0, 100))).chats
       ]
   )

   if values:
       await client.send_message(
           event.chat.id,
           f"**Common Chats with **[{user}, #{user_entity.id}](tg://user?id={user_entity.id}):\n\n{values}",
   …