How to create a child theme

I am trying to set up a child theme for primer. I know that this should be extremely simple, but I am struggling and would be very appreciative of any help you could give.

This is what I’ve done thus far:
1) Created a folder called primer-child-hp
2) created a file called style.css with the following in it.
/*
Theme Name: Primer Child Theme
Template: primer
Version: 1.0.0
*/

3) I have created a functions.php file with the following in it:

<?php
function mychildtheme_enqueue_styles() {
$parent_style = ‘primer’;

wp_enqueue_style( $parent_style, get_template_directory_uri() . ‘/style.css’ );
wp_enqueue_style( ‘child-style’,
get_stylesheet_directory_uri() . ‘/style.css’,
array( $parent_style )
);
}
add_action( ‘wp_enqueue_scripts’, ‘mychildtheme_enqueue_styles’ );
?>

I have tried many different variations of this, but what should the $parent_style equal?

Is that what I am doing wrong?

Thank you very much in advance.