1957. Delete Characters to Make Fancy String

A fancy string is a string where no three consecutive characters are equal.

Given a string s, delete the minimum possible number of characters from s to make it fancy.

Return the final string after the deletion. It can be shown that the answer will always be unique.

class Solution {
public:
    string makeFancyString(string s) {
        string res = "";
        for(auto& ch : s) {
            if(res.size() >= 2 and res.back() == ch and res[res.size()-2] == ch) continue;
            res.push_back(ch);
        }
        return res;
    }
};