CSS file path error

The plugin enqueues css file with double slash, similar to
https://…/wp-content/plugins/column-shortcodes//assets/css/shortcodes.css

Notice the double slash just prior to assets folder name.

column-shortcodes.php contains;
wp_enqueue_style( 'cpsh-shortcodes', $this->get_url() . '/assets/css/shortcodes.css', array(), $this->get_version(), 'all' );

… where $this->get_url() produces path with trailing slash like;
https://.../wp-content/plugins/column-shortcodes/

… and as the following static path to css file starts with slash, it causes the double slash in the path.