Add Wordpress html sitemap without plugin

Would you like to add sitemap to your Wordpress, here is the simple way to create stemap without plugin.
Let's start it!
1. Create a new php file in your current activated theme folder and save it as sitemap.php
2. Paste the below code in it

<?php
/*
Template Name: Sitemap
*/
?>
<?php get_header(); ?>
<div id="content" >
  <div class="post">
    <div class="title">
      <h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>">
        <?php the_title(); ?>
<!-- ----------------- Display Post with its relative category ----------------- -->
        </a></h2>
    </div>
    <div class="entry siteMap">
      <h2 id="posts">Posts</h2>
      <ul>
        <?php
// Add categories seprated with comma (,) you'd like to hide to display on sitemap
$cats = get_categories('exclude=');
foreach ($cats as $cat) {
  echo "<li><h3>".$cat->cat_name."</h3>";
  echo "<ul>";
  query_posts('posts_per_page=-1&cat='.$cat->cat_ID);
  while(have_posts()) {
    the_post();
    $category = get_the_category();
    // Only display a post link once, even if it's in multiple categories
    if ($category[0]->cat_ID == $cat->cat_ID) {
      echo '<li><a href="'.get_permalink().'">'.get_the_title().'</a></li>';
    }
  }
  echo "</ul>";
  echo "</li>";
}
?>
      </ul>
<!-- ----------------- Display Categories ----------------- -->
      <h2>Categories</h2>
      <ul>
        <?php wp_list_cats("sort_column=name&feed_image=/wp-content/themes/Horcrux/images/rss-small.png&optioncount=1&hierarchical=0"); ?>
      </ul>
<!-- ----------------- Display Pages ----------------- -->
      <h2 id="pages">Pages</h2>
      <ul>
        <?php
// Add pages seprated with comma[,] that you'd like to hide to display on sitemap
wp_list_pages(
  array(
    'exclude' => '',
    'title_li' => '',
  )
);
?>
      </ul>
    </div>
  </div>
</div>
<?php get_sidebar(); ?>
<?php get_footer(); ?>

3. Go to your Admin, create page and name it as “Site Map”.

4. Assign to this page “Sitemap” template
That's all, enjoy.