<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd"> 
<preference for="Magento\Wishlist\Controller\Index\Cart" type="Myfitmix\Wishlist\Controller\Wishlist\Cart"/>
</config>