Creating Canonical URL for Dynamic Page

Question

I already created the Canonical URL for Dynamic Page using below code

My code:

function aioseo_filter_canonical_url( $url ) {
            $pageurl="medical-billing-coding-services/";
            $statecode=mp_usstate_slug_shortcode();
              if ( is_singular() && strpos($url,$pageurl)!==false && !empty($statecode)) {
                 $newurl=substr($url,0,-1);
                 $newurl .= '-' . $statecode . '/';
                 return $newurl;
               }
              return $url;
             }

Output is:

<link rel="canonical" href="https://example.com/medical-billing-coding-services-alabama/" />

I need the canonical URL should appear like below, which means state name should appear before

https://example.com/alabama-medical-billing-coding-services/

I want to use the same code to make the URL change like above. How to change it?