Vantage-Child theme doesn’t work

hi,
I’m using the Vantage theme and i’ve tried to create a child-theme to costumize the CSS of my website, but there’s a problem:
The style.css of the child theme doesn’t work, in fact it seems that it doesn’t overwrite the changes on the parent theme.
I wrote this code in functions.php of my child theme:

function my_theme_enqueue_styles() {
$parent_style = ‘vantage-style’;

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 ),
wp_get_theme()->get(‘Version’)
);
}
add_action( ‘wp_enqueue_scripts’, ‘my_theme_enqueue_styles’);

I hope someone can help me and I thank you in advance.