same here.

"
The expression (as strings) (res) == ("taxi") is false: actual=taxi expected=taxi.
"

i have the same issue.

in the ide of codewars, my code identifies n-1 duplicates in the string
whereas I ve compiled it with the random case string in a .c on my terminal and the same code identifies n duplicates (as would be needed to pass the last random case).
I m quite uneducated in the matter, my 2cents would be a compiler finesse.
I ll keep learning.