changed post_permalink() to get_permalink()
changed post_permalink() to get_permalink()

post_permalink appears deprecated and might cause a Wordpress-notice within the <a>-Tag:
<a href="<br />
<b>Notice</b>:  post_permalink ist seit Version 4.4.0 <strong>veraltet</strong>! …>
… </a>

https://developer.wordpress.org/reference/functions/post_permalink/
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