2390. Removing Stars From a String

class Solution {
    public String removeStars(String s) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            if (c == '*') {
                sb.deleteCharAt(sb.length() - 1);
            } else {
                sb.append(c);
            } 
        }

        return sb.toString();
    }
}

References

2390. Removing Stars From a String