why pagniate_links not working any more in wordpress

paginate links shows a whitespace in my website i stuck for 2 days and the issue didn’t resolve

my code in function.php

function pagination_bar(){
   global $wp_query;

   $big = 999999999; // need an unlikely integer
    
   echo paginate_links( array(
       'base'    => str_replace( $big, '%#%', esc_url( get_pagenum_link( $big ) ) ),
       'format'  => '?paged=%#%',
       'current' => max( 1, get_query_var('paged') ),
       'total'   => $wp_query->max_num_pages
   ) );
}

my function call in index.php

<?php pagination_bar();?>

please Help??