Add salutation field to billing address in Drupal Commerce

hooks.php

<?php

    function hook_commerce_inline_form_customer_profile_alter(&$inline_form,FormStateInterface $form_state,array &$complete_form) {
        $inline_form['#after_build'][]='after_build';
    }

    function after_build(&$form) {
        $address=&$form['address']['widget'][0]['address'];
        $address['field_salutation']=$form['field_salutation'];
        $address['field_salutation']['#weight']=-3;
        $address['container1']['#weight']=-2;
        $address['organization']['#weight']=-1;
        $address['country_code']['#weight']=1;
        unset($form['field_salutation']);

        return $form;
    }