Regiser Link does not work

My Site URL is like this localhost/site but the Register link point to “localhost/wp-login.php?action=register&redirect_to=”

FIXED
On line 150
href=" <?php if (empty($register_url)) {echo '/wp-login.php?action=register&redirect_to=';}

I added site_url(). changing the line to

href=" <?php if (empty($register_url)) {echo site_url().'/wp-login.php?action=register&redirect_to=';}