You must implement:

string rotate$\_$vowels$($string& s$)$;

This function must accept a string parameter s by reference, and change it directly by replacing each vowel with its alphabetical successor among vowels defined circularly. That is$,$ replace $$a with $$e$,$e with $$i$,$ i with $$o$,$o with $$u and $$u with $$a$.$ For example, after executing the following two lines,

string s $=$ "that's really cool"; rotate$\_$vowels$($s$)$;

the variable s should contain the string $"$thet$\text{'}$s rielly cuul$"$

In addition to changing the parameter passed in by reference, it must ALSO return this parameter.

See what happens if you implement a case$-$sensitive version of this function.

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