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function wp_enqueue_woocommerce_style(){
	wp_register_style( 'mytheme-woocommerce', get_template_directory_uri() . '/css/woocommerce.css' );
	
	if ( class_exists( 'woocommerce' ) ) {
		wp_enqueue_style( 'mytheme-woocommerce' );
	}
}
add_action( 'wp_enqueue_scripts', 'wp_enqueue_woocommerce_style' );