Bootstrap isn’t called into my WordPress theme

Put this code in functions.php file and check it.

function theme_add_bootstrap() {
wp_enqueue_style( 'bootstrap-css', get_template_directory_uri() . '/bootstrap/css/bootstrap.min.css' );
wp_enqueue_style( 'style-css', get_template_directory_uri() . '/style.css' );
wp_enqueue_script( 'bootstrap-js', get_template_directory_uri() . '/bootstrap/js/bootstrap.min.js', array( 'jquery' ), '3.0.0', true );
}
add_action( 'wp_enqueue_scripts', 'theme_add_bootstrap' );