function largestString(s: string): string {
  const chars = s.split("");
  let cur = "";
  let i = chars.length - 1;

  while (i >= 0) {
    cur = chars[i] + cur;

    if (cur.length === 3) {
      if (cur === "abb") {
        chars[i] = "b";
        chars[i + 1] = "a";
        chars[i + 2] = "a";

        if (chars[i + 4] !== undefined && chars[i + 4] === "b") {
          i += 4 + 1;
        } else if (chars[i + 3] !== undefined && chars[i + 3] === "b") {
          i += 3 + 1;
        } else if (chars[i + 2] === "b") {
          i += 2 + 1;
        }
      }
      if (chars[i + 1] === "b") {
        i += 1 + 1;
      } else {
        i += 1;
      }
      cur = "";
    }

    i--;
  }

  return chars.join("");
}