Get & show User custom field data with Shortcode

/**
* Get & show User custom field data with Shortcode
**/

function current_user_data_func( $atts ) {

    extract( shortcode_atts( array(
        'metakey' => '',
        'user_field' => '',
    ), $atts) );
     ob_start();
    if(is_user_logged_in())
    {
        $current_user = wp_get_current_user();

        $c_user_id = $current_user->ID;
        if(!empty($metakey))
        {
            $value = get_user_meta( $c_user_id, $metakey, true);
            echo $value;
        }

        if(!empty($user_field))
        {
            echo $current_user->{"$user_field"};

        }

    }
    else
    {
        echo "User Not Logged In";
    }
  return ob_get_clean();
}
add_shortcode( 'current_user_data', 'current_user_data_func' ); // Shortcode Usage: [current_user_data metakey="uf_staffname"]