Randomize testimonials

Hi, I have tried both the code combinations on the original page and neither work. I have placed the file in a child theme, using the same directory structure. Her’s the entire code of the testimonials.js page. You can see the output at: https://newsblocks.io/news-is-data/

(function($)
{ 
	"use strict";
	
	// -------------------------------------------------------------------------------------------
	// testimonial shortcode javascript
	// -------------------------------------------------------------------------------------------

$.fn.randomize = function(childElem) {
  return this.each(function() {
      var $this = $(this);
      var elems = $this.children(childElem);

      elems.sort(function() { return (Math.round(Math.random())-0.5); });  

      $this.remove(childElem);  

      for(var i=0; i < elems.length; i++)
        $this.append(elems[i]);      

  });    
} (jQuery);	

	
	$.fn.avia_sc_testimonial = function(options)
	{
		return this.each(function()
		{
			jQuery(".avia-testimonial-row").randomize(".avia-testimonial");
			var container = $(this), elements = container.find('.avia-testimonial');
	
	
			//trigger displaying of thumbnails
			container.on('avia_start_animation', function()
			{
				elements.each(function(i)
				{
					var element = $(this);
					setTimeout(function(){ element.addClass('avia_start_animation') }, (i * 150));
				});
			});
		});
	}
	
}(jQuery));

The above code does not work.