I'm proposing 3 minor changes to C++ version

• Fixing broken sample test cases
• passing std::string by const & instead of by value to the function itself
• some whitespace fixes

Please reaview and/or approve.

Java:
arguments in assertEquals are swapped.

C++ test has some problems, but attempt works well. Check it, please

• Hi Zoltan , Hope you're doing Well bro ..

• Description didn't mention anything about Case Sensitivty , For Example Counting only small alphas as 'h' or the Capital Ones 'H' or Both of them, Yet the Sample Tests Have Both of them ??

• Also Alexander's Issue Below concerning Sample test Cases didn't Resolved yet ?? .. Cheers

If it's always one character, its type should be char. Also, heavy input arguments should better be passed as const reference.
For the count a better type would be something like std::string::size_type or std::size_t.