Function reverseString

void setup() {
  size(200, 200);
  background(2);
  String a = "Computer";
  textSize(20);
  text("Reverse : "+reverse(a), 10, 100);
}
String reverse(String C) {
  String B = "";
  int i=0;
  while (i<C.length ()) {
    char j=C.charAt(C.length()-1-i);
    B=B+j;
    i=i+1;
  }
  return B;
}