const makeItFunny = (string, n) => {
  let i = 0;
  let result = '';
  while (i < string.length) {
    if ((i + 1) % n === 0) {
      result += `${string[i].toUpperCase()}`;
    } else {
      result += `${string[i]}`;
    }
    i++;
  }
  return result;
};