Challenge: write a really really small front() for UTF8

[Anonymous]

dchar front(char[] s) {
     uint c = s[0];
     ubyte p = ~s[0];
     if (p>>7)
       return c;
     c = c<<8 | s[1];
     if (p>>5)
       return c;
     c = c<<8 | s[2];
     if (p>>4)
       return c;
     return c<<8 | s[3];
}