sep_24.js

 function fold(arr) {
   let start = 0;
   let end = arr.length - 1;
   const res = []
   while (start < end) {
     res.push(arr[start] + arr[end]);
     start++;
     end--;
   }
   if (arr.length % 2 === 1) res.push(arr[start])
   return res;
 }

 function foldArray(arr, x) {
  for (let i = 0; i< x; i++){
    arr = fold(arr)
  }
  console.log(arr)
  return arr
}

function calculate(string) {
  const arr = string.split(/(?=[A-Z])/);
  
}