What's the mistake ? kindly check and modify

#1
#2

hi @vanshikasharma1645 this should be the compare function

bool comparator(string s1, string s2){
    if (s1.find(s2) != string::npos) {
        return s1.length() > s2.length();
//if substring is found, string with bigger length should come first
    }
    if (s2.find(s1) != string::npos) {
        return s2.length() > s1.length();
    }

//else sort lexicographically
    return s1 < s2;
}
#3

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