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Look at this link "efreedom.com/Question/1-198199/Reverse-String-Place-C-CPlusPlus"

The function called "strrev_utf8" in here should be able to do it, though i have not tested it. A normal reversal does not work.

1. Reverse the string.
2. Do pairwise exchange.

That would not work since UTF-8 characters are not fixed length. It could be 1 byte, 2 bytes, or 4 bytes. We can't just do a reverse and do pairwise exchange. But your method would work for UTF16 strings.

l=strlen(str);
i=0;
for(k=l-1; k>=1; k++)
{
str[l]=str[i]; // save
for(j=0; j<k; j++) str[j]=str[j+1]; // shift left
str[k]=str[l]; // restore
i++
}
str[l]=0;