Help me in solving SQLP50 problem

My issue

else “None” end as category
when rating between 1800 and 1999 then “4 Star”
when rating between 2000 and 2199 then “5 Star”
select user_name , case
when rating between 2200 and 2499 then “6 Star”
from Users group by user_name;

Learning course: SQL Practice Queries
Problem Link: Group users Practice Problem in SQL Practice Queries