Can help me to create class library of phpspreadsheet like PHPexcel in codeigniter 3 to load it    in autoload config
and how to move this folder under third_party under my application 
I am create the file under library folder 
but not working , have  Unable to load the requested class: Spreadsheet

i am create the file under library folder 

but not working , have  Unable to load the requested class: Spreadsheet

when try to load it same library  

` <?php if (!defined(‘BASEPATH’))
exit(‘No direct script access allowed’);
require DIR . ‘vendor/autoload.php’;

use phpofficephpspreadsheetSpreadsheet;
use phpofficephpspreadsheetWriterXlsx;

class Phpspreadsheet extends Spreadsheet
    {
    public function __construct()
    {
    parent::__construct();
   }
}

`