Cannot run as a restricted user

[kadirovazizbek]

I tried to follow Security steps and created restricted_user using adduser command, set password for it, added necessary lines to sudoers file. Then I commented and uncommented necessary lines. Now when I submit code, it says "Runtime error". As I see, restricted user has no permissions to create log directories and files. I tried to run "sudo -u restricted_user mkdir log" in my "assignments/assignment_8/p1/admin" directory, and got "Permission denied" error. My assignments and tester folders are located in /var/www/acm****/private/ directory. I tried to move them to web root, but no success, the same error.
What steps I missed? Maybe i have to make restricted_user a root?