WordPress change default stylesheet location

wpStylesheet.php

<?php
/*
 Add these code to your functions.php
 This will only change the stylesheet/stylesheet dir uri
 But will not add theme info from the new location
 To fix you must place another style.css with theme information in theme root directory (i.e: wp-content/themes/twintysixteen/)
*/

add_filter('stylesheet_uri','wpi_stylesheet_uri',10,2);

/**
 * wpi_stylesheet_uri
 * overwrite default theme stylesheet uri
 * filter stylesheet_uri
 * @see get_stylesheet_uri()
 */
function wpi_stylesheet_uri($stylesheet_uri, $stylesheet_dir_uri){

    return $stylesheet_dir_uri.'/css/mytheme.css';
}

add_filter('stylesheet_directory_uri','wpi_stylesheet_dir_uri',10,2);

/**
 * wpi_stylesheet_dir_uri
 * overwrite theme stylesheet directory uri
 * filter stylesheet_directory_uri
 * @see get_stylesheet_directory_uri()
 */
function wpi_stylesheet_dir_uri($stylesheet_dir_uri, $theme_name){

	$subdir = '/css';
	return $stylesheet_dir_uri.$subdir;

}