Controller with extending Telegram Bot php Library for Codeigniter

Welcome.php

<?php defined('BASEPATH') OR exit('No direct script access allowed');
date_default_timezone_set('Asia/Tashkent');

use Longman\TelegramBot\Entities\InlineKeyboard;
use Longman\TelegramBot\Entities\Keyboard;
use Longman\TelegramBot\Exception\TelegramException;
use Longman\TelegramBot\Request;
use Longman\TelegramBot\Telegram;
use Longman\TelegramBot\TelegramLog;
use Longman\TelegramBot\DB;

class CITelegram extends Telegram{
	
	public $ci;
	
	public function __construct($api_key, $bot_username = '')
    { 
        if (empty($api_key)) {
            throw new TelegramException('API KEY not defined!');
        }
		
        preg_match('/(\d+)\:[\w\-]+/', $api_key, $matches);
        if (!isset($matches[1])) {
            throw new TelegramException('Invalid API KEY defined!');
        }
        $this->bot_id  = $matches[1];
        $this->api_key = $api_key;

        if (!empty($bot_username)) {
            $this->bot_username = $bot_username;
        }

        //Add default system commands path
        $this->addCommandsPath(TB_BASE_COMMANDS_PATH . '/SystemCommands');
		$this->ci = &get_instance();  
        Request::initialize($this);
    } 
}

class Welcome extends CI_Controller
{

Hey do you have example implementation this library bot to codeigniter ? I try it but bot no respon