2390. Removing Stars From a String

You are given a string s, which contains stars *.

In one operation, you can:

• Choose a star in s.
• Remove the closest non-star character to its left, as well as remove the star itself.

Return the string after all stars have been removed.

Note:

• The input will be generated such that the operation is always possible.
• It can be shown that the resulting string will always be unique.

class Solution {
public:
    string removeStars(string s) {
        string res = "";
        for(auto& ch : s) {
            if(ch == '*') {
                if(!res.empty()) res.pop_back();
            } else res.push_back(ch);
        }
        return res;
    }
};