Problem Statement

Take a string and reverse it. For example, "asdf" becomes "fdsa".

Preserve Unicode combining characters. For example, "as⃝df̅" becomes "f̅ds⃝a", not "̅fd⃝sa".

Let's start with the solution:

reverse("foo");

#charset utf8
void main()
{
    string s = "ßÜÖÄüöää ἀρχῇ";    
    write("%s\n", string_to_utf8( reverse(s) ));
}