var vowelDoubler = (array) => {
  var len = array.length;
  for (var i = 0; i < array.length; i++) {
    if(array[i] === 'a' || array[i] === 'e' || array[i] === 'i' || array[i] === 'o' || array[i] === 'u'){
      len++;
    }
  }
  var x = array.length-1;
  for(i = len-1; i >=0; i-- ){
    console.log(array);
    array[i] = array[x];
    if(array[x] === 'a' || array[x] === 'e' || array[x] === 'i' || array[x] === 'o' || array[x] === 'u'){
      i = i-1;
      array[i] = array[x];
    }
    x--;
  }
  return array;

};