@@ -0,0 +1,343 @@
+// http://codingbat.com/prob/p122943%0A%0Apublic String oneTwo(String str) %7B%0A  if (str.length() %3C 3) %7B%0A    return %22%22;%0A  %7D%0A  %0A  StringBuilder sb = new StringBuilder();%0A  %0A  for (int i = 0; i %3C str.length() - 2; i += 3) %7B%0A    sb.append(str.charAt(i+1));%0A    sb.append(str.charAt(i+2));%0A    sb.append(str.charAt(i));%0A  %7D%0A  %0A  return sb.toString();%0A%7D%0A

Create oneTwo.java