How To turn around a character sequence;

How to turn around a character sequence?
I tried using for but failed..
If you have some problem with your code then show it and say what is the problem.
By "character sequence" do you mean a char array? Or a string? Because the former is a great question since it runs up against Turing's Halting problem where as the later has a member function that tells you how long the sequence is.
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