Fix bot mention prefix response logic

main.py

@@ -70,11 +70,11 @@ class Vocard(commands.Bot):
             return False
 
         # Check if the bot is directly mentioned
-        if self.user.id in message.raw_mentions and not message.mention_everyone:
+        if message.content.strip() == self.user.mention and not message.mention_everyone:
             prefix = await self.command_prefix(self, message)
             if not prefix:
                 return await message.channel.send("I don't have a bot prefix set.")
-            await message.channel.send(f"My prefix is `{prefix}`")
+            return await message.channel.send(f"My prefix is `{prefix}`")
 
         # Fetch guild settings and check if the mesage is in the music request channel
         settings = await func.get_settings(message.guild.id)