code: def register(self, command: str, handler: Any):
          
  
          if not command.startswith("/"):
              command = f"/{command}"
  
          LOG.info("Registering %s to %s", command, handler)
          self._routes[command].append(handler)
docs: Register a new handler for a specific slash command
  
          Args:
              command: Slash command
              handler: Callback