src/Common/Formatter/Sequencer.php
public static function command(CommandInterface $command)
    {
        return [
            'channel'   => self::sequence('#'.$command['channel_id'], $command['channel_name']),
            'user'      => self::sequence('@'.$command['user_id'], $command['user_name']),
        ];
    }
public static function command(CommandInterface $command)
    {
        return [
            'channel'   => self::sequence('#'.$command['channel_id'], $command['channel_name']),
            'user'      => self::sequence('@'.$command['user_id'], $command['user_name']),
        ];
    }
@param CommandInterface $command

@return array