How To Prevent The Function Running Multiple Times On Page Load

i’m using a very light plugin that will shorten a URL. The connection is made and I can see the URL being shortened in the frontend content.

My issue is when a new page is loaded on the front end, the function to shorten the link runs multiple times on every page load. I can’t seem to figure out how to have it run only once as each page loads

Here’s the breakdown. it’s stored in a plugin php file

function shrinkit { //shrinking the link using an api key }
// Creates the shortcode next
function shortcode_shrinkit($atts,$content){
   return shrinkit($content);
}
// Register the shortcode
add_shortcode("shrunk", "shortcode_shrinkit");