WordPress, get custom post type slug

slugger.php

/**
 * Gets a slug of a custom posty
 * @param  string $post_type The post type wanted
 * @return string            Slug for the post type
 */
function slugger($post_type)
{
    if ($post_type) {
        $post_type_data = get_post_type_object($post_type);
        $post_type_slug = $post_type_data->rewrite['slug'];
        return $post_type_slug;
    }
}