How to add a shortcode function that returns the taxonomy slug of the actual post within the loop

Circumstances: I have a CPT called “designs” and a taxonomy related to it, called “project_category” so that I can assign a category to each design. I’m building the template for each ‘design’ and I need a shortcode that returns the assigned project category SLUG of the current design within the loop.

Search CPT by tag ids

I need to search custom post type by tagids. I have created a post type that is “gampu”. In this post type i have register 5 tags taxonomy like ‘fitting’, ‘adapter’, ‘type’, ‘volume’ and ‘gaki’. Now admin can create many tags in this tag taxonomies and when admin create any post then they will select the tags from all of those 5 register tag taxonomies.