C++ String Function (strlen, strrev, strcat, strcmp) in c++ Program?

I am Written Some code in C++ that is meant to String Function (strlen, strrev, strcpy, strcat, strcmp) in c++ Program. I know this isn't the smartest way to do it but i am just trying and my experience why this program force method isn't working when i code it. Any Feedback would be very much Appreciated.

Strlen

Strrev

Output

Strcmp

Output

Strcat

Output

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