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Colon is Missing In My Website Url in WordPress

add_action( 'init', function() {

    add_shortcode( 'site_url', function( $atts = null, $content = null ) {
        return site_url();
    });

});

I’m Using The Short Code [site_url] and My Short Code Function Returned https//shad-pro.com/contact-us

How Do I get The Proper Url With Colon :

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