linked in share button not showing post content

I have been trying to implement a “linked in share button” to my wordpress site and failing at getting the content to be shared.

this is my current code:

<script type="text/javascript" src="https://platform.linkedin.com/in.js"></script>
<script type="in/share" data-url="<?php echo get_permalink($post->ID); ?><?php echo the_excerpt(); ?>" data-counter="right" ></script>

This only adds a link to the blogs main url not the post or an excerpt.

any help or ideas would be greatly appreciated.