Link css through a function

Hi everyone,
Help needed 😀 I am trying to link my style.css through the function.php but that is not working,
My code is:

<?php
/**
* Enqueue scripts and styles. */
function csslinktheme() {

// Enqueue default style
wp_enqueue_style(‘style_css’, get_stylesheet_uri());
}

add_action( ‘wp_enqueue_scripts’, ‘csslinktheme’ );

get_stylesheet_uri();

Without the last line it does not work either

Any ideas? Thanks a lot