Previous/Next Post in Genesis (Featured Image)

prev-next-post-genesis-image.php

// ADD NEXT/PREV POST + Add Featured Images To Previous & Next Post Nav Links
add_action('genesis_after_entry', 'wpsites_image_nav_links', 9 );
/**
 * @author    Brad Dalton
 * @link   http://wpsites.net/web-design/add-featured-images-to-previous-next-post-nav-links/
 * //https://crunchify.com/how-to-display-last-updated-on-datetime-of-your-wordpress-blog-post-genesis-framework-hook-included/
//https://stackoverflow.com/questions/7563568/display-post-date-on-previous-next-link
// https://sridharkatakam.com/add-links-previous-post-next-post-single-posts-genesis/
 */
function wpsites_image_nav_links() {

if( !is_singular('post') ) 
      return;

if( $prev_post = get_previous_post() ): 
echo'<span class="single-post-nav previous-post-link">';
$prevpost = get_the_post_thumbnail( $prev_post->ID, 'medium', array('class' => 'pagination-previous')); 
// previous_post_link( '%link',"$prevpost  <p>← Previous Post</p>", TRUE );
previous_post_link( '%link',"$prevpost" );
previous_post_link( '%link', '&#x000AB; Previous Post: %title' );
echo'</span>';
endif; 

if( $next_post = get_next_post() ): 
echo'<span class="single-post-nav next-post-link">';
$nextpost = get_the_post_thumbnail( $next_post->ID, 'medium', array('class' => 'pagination-next')); 
//next_post_link( '%link',"$nextpost  <p>Next Post →</p>", TRUE );
next_post_link( '%link',"$nextpost" );
next_post_link( '%link', 'Next Post: %title &#x000BB;' );
echo'</span>';
endif; 
}