/**
 * @author Tech Tamer
 */
 
 function unscramble(str) {
   var out = '';
   var j = 0;
   for (var i = str.length - 1; i >= 0; i--) {
     if ((i % 2)) {
       j = i - 1;
     }
     else {
       j = Math.min(i + 1, str.length-1);
     }
     out = str.charAt(j) + out;
   }
   return out.replace(/\s/, "");
};