HELP!!!!! I updated my child, functions.php and I broke my website

i copied the original divi child theme ‘functions.php’ code and saved it as a .rtf file…then I added code to change my ‘add to cart’ button text. the website and WP/admin went belly-up…blank screens. I hit the back arrow and got my WP admin back… i pasted the original code back into the functions.php and updated.

it’s still broken! Nothing but white screens. if i hit the back arrow i get my admin back, but the website and WP admin are broken. if i update again…nothing but white screens for WP and website.
i’m using divi and woocommerce. here’s the original code:

<?php

//* Create Portfolio Type custom taxonomy
add_action( 'init', 'divi_type_taxonomy' );
function divi_type_taxonomy() {

	register_taxonomy( 'portfolio-type', 'portfolio',
		array(
			'labels' => array(
				'name'          => _x( 'Types', 'taxonomy general name', 'divi' ),
				'add_new_item'  => __( 'Add New Portfolio Type', 'divi' ),
				'new_item_name' => __( 'New Portfolio Type', 'divi' ),
			),
			'exclude_from_search' => true,
			'has_archive'         => true,
			'hierarchical'        => true,
			'rewrite'             => array( 'slug' => 'portfolio-type', 'with_front' => false ),
			'show_ui'             => true,
			'show_tagcloud'       => false,
		)
	);

}

//* Create portfolio custom post type
add_action( 'init', 'divi_portfolio_post_type' );
function divi_portfolio_post_type() {

	register_post_type( 'portfolio',
		array(
			'labels' => array(
				'name'          => __( 'Portfolio', 'divi' ),
				'singular_name' => __( 'Portfolio', 'divi' ),
			),
			'has_archive'  => true,
			'hierarchical' => true,
			'menu_icon'    => 'dashicons-portfolio',
			'public'       => true,
			'rewrite'      => array( 'slug' => 'portfolio', 'with_front' => false ),
			'supports'     => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'trackbacks', 'custom-fields', 'revisions', 'page-attributes' ),
			'taxonomies'   => array( 'portfolio-type' ),

		)
	);

}

//* Change the number of portfolio items to be displayed (props Brad Dalton)
add_action( 'pre_get_posts', 'divi_portfolio_items' );
function divi_portfolio_items( $query ) {

	if( $query->is_main_query() && !is_admin() && is_post_type_archive( 'portfolio' ) ) {
		$query->set( 'posts_per_page', '12' );
	}

}

/*
 * wc_remove_related_products
 *
 * Clear the query arguments for related products so none show.
 * Add this code to your theme functions.php file.
 */
 /*
function wc_remove_related_products( $args ) {
	return array();
}
*/
//add_filter('woocommerce_related_products_args','wc_remove_related_products', 10); 

function woocommerce_remove_related_products(){
    remove_action( 'woocommerce_after_single_product_summary', 'woocommerce_output_related_products', 20);
}
add_action('woocommerce_after_single_product_summary', 'woocommerce_remove_related_products');

// GET 4 products
function woocommerce_upsell_display( $posts_per_page = 4, $columns = 4, $orderby = 'rand' ) {
woocommerce_get_template( 'single-product/up-sells.php', array(
'posts_per_page' => $posts_per_page,
'orderby' => $orderby,
'columns' => $columns
) );
}