swift data not transferred rightBarButtonItem to viewcontroller

My data from rightBarButtonItem is not to CartViewcontroller. I have provided the link here - https://stackoverflow.com/q/63956420/7444874 I have been ruminating over for quite some time. Please save my skin.
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It was a rookie mistake. I had named the Segue incorrectly. It is “showCart” in the ProductViewController, while I was naming it “ShowCart” i.e. upper case letter “S”. It is puny but formidable ! Anyways, thanks for looking into my problem.
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