change default RSS feed URL

I found my answer here :
https://wordpress.stackexchange.com/a/214883/71314

function remove_feed( $feedname ) {
    global $wp_rewrite;

    if ( in_array( $feedname, $wp_rewrite->feeds ) ) {
            $wp_rewrite->feeds = array_diff( $wp_rewrite->feeds, array( $feedname ) );
    }

    $hook = 'do_feed_' . $feedname;

    // Remove default function hook
    remove_all_actions( $hook );
    add_action( $hook, $hook );

    return $hook;
}

Usage:

remove_feed( 'feed' );