Nice use of range and convertion to string.

Fixed by fork above

My PHP code fails one of the simple tests, but passes the full suite. Could You check, what's wrong?

yep, a little tool.

I am unable to view the comment because it is flagged as a spoiler 😕

If you want easier kata you can sort the the 8kyus. They are normally sorted by newest. You can sort them by easiest or most completed to get easier katas

No, copy your code, click reset, paste it and try again.

Did anyone else get this error:

src/test/java/Test.java:2: error: Test is already defined in this compilation unit
import org.junit.Test;
^
1 error

Please use spoiler flag next time.

what did you suggest ?

ROFL

Super!
But portablity is broken, as it will not work on a CPU with a different instruction set.