Unused pointer matters to code coach output😭🤔

Question

I was solving Extra-territorials, and I have just found that my unused pointer matters to case #5.
Can anyone explain this to me???
https://www.sololearn.com/coach/51?ref=app

Answer 1

https://code.sololearn.com/cj2qm8Zc6K9B/?ref=app
Thank you!

Answer 2

If you erase the pointer, case 5 becomes wrong.

Answer 3

Code coach expext the ouput exactly same as required not more not less..
For ex:
Expexted is "hello" then output only "hello" not with extra blanks or extra unvisible charecters.

I think warning does not count but errors matters..
Edit:
You need just to reversly output the string.. You can try without pointers.. Or else post your code here..