Why ı cant change plugin.js path?

I am trying to implement Infinty-v2.0.0 theme. Why url has two dot ?I m sure there wasnt dot character in url(the error was shown in the pictures) . Pages are mostly work.But everytime when ı refresh page ,ı get plugin.js error in every time.I think this error cause switchery.min.css not found or another error . How can fix plugin.js ?

 <?php
    <script src="<?php echo base_url("assets");?>/assets/js/plugins.js"></script> ?php>

datatables.min.css

switchery.min.css