Pagination Issue in Codeigniter [solved]

There is many students face problem in Pagination library in CI
CodeIgniter

Please update the following code and your problem resolved

public function index($index=1)
    {
        $per_page=2;   // set accorrding to requiremnet
       if($index==1){
           $index=0;
       }
         
         $this->load->model("MODLE_NAME");
            $user_data['user_data']=$this->Model_name->select($per_page,$index);
            $t=$this->Model_name;
            $table_name=$t::table_name;
            $query = $this->db->get($table_name);
            $row_count=$query->num_rows();
   // pagination     
       $this->load->library('pagination');

            $config['base_url'] = base_url().'admin/controller_function/index/';
            $num_rows_pagination=$row_count;
            $config['total_rows'] = $num_rows_pagination;
            $config['per_page'] = $per_page;
             $config['uri_segment'] = 4;
               // pagination formating
                    $config['full_tag_open'] = "<br><ul class='pagination'>";
                    $config['full_tag_close'] ="</ul>";
                    $config['num_tag_open'] = '<li>';
                    $config['num_tag_close'] = '</li>';
                    $config['cur_tag_open'] = "<li class='disabled'><li class='active'><a href='#'>";
                    $config['cur_tag_close'] = "<span class='sr-only'></span></a></li>";
                    $config['next_tag_open'] = "<li>";
                    $config['next_tagl_close'] = "</li>";
                    $config['prev_tag_open'] = "<li>";
                    $config['prev_tagl_close'] = "</li>";
                    $config['first_tag_open'] = "<li>";
                    $config['first_tagl_close'] = "</li>";
                    $config['last_tag_open'] = "<li>";
                    $config['last_tagl_close'] = "</li>";
            
            $this->pagination->initialize($config); 
            $user_data['pagination']= $this->pagination->create_links();
            $user_data['total_row']=$row_count;
            $user_data['page'] = 'controller_function';
        $this->load->view('admin/Manage/view_page',$user_data);   // Customize according its to view panel
       
   }
 
                           //---------------WARNING------------ 
 
//================= YOUR MODEL and Controller According to your Project ================