Avoide RSS feeds indexing in search engines

Hi,

Yesterday i published a post in my blog techpopular.com, suddenly RSS feeds are getting indexed in Google search, i did no modification to theme or SEO settings.

Since yesterday i’m seeing the RSS feeds like

https://techpopular.com/flipkart-in-a-day-guarantee-service/?utm_source=rss&utm_medium=rss&utm_campaign=flipkart-in-a-day-guarantee-service

The actual URL is missing in search and the above URL is indexed in GOogle search. Can you please tell me how to block them and index the actual one.

Thanks in advance