1717. Maximum Score From Removing Substrings

class Solution {

public:
    int maximumGain(string s, int x, int y) {
        int points=0;;

        auto removePairs = [&](char first, char second, int point){
            string newString;
            int tempPoints=0;
            for(char ch : s){
                if(!newString.empty() && newString.back()==first && ch==second){
                    tempPoints+=point;
                    newString.pop_back();
                }else{
                    newString.push_back(ch);
                }
            }
            s=newString;
            return tempPoints;
        };
        if(x>y){
            points+=removePairs('a','b',x);
            points+=removePairs('b','a',y);
        }else{
            points+=removePairs('b','a',y);
            points+=removePairs('a','b',x);
        }
        return points;
    }
};