24. 2390. Removing Stars From a String

class Solution {
    public String removeStars(String s) {
      StringBuilder sb = new StringBuilder();

      for(char ch:s.toCharArray()){
        if(ch=='*' && sb.length()>0){
            sb.deleteCharAt(sb.length()-1);
        }else{
            sb.append(ch);
        }
      }
        return sb.toString();
    }
}