func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string s, ans, s1;     cin >> s;     s1 = s;     int l = s.length(), i;     int j = l - 1, flag = 0;     while (i < j) {       if (s[i] != s[j]) {         flag = 1;         break;       }       i++;       j--;     }     if (flag) {       reverse(s1.begin(), s1.end());       ans = s + s1;       cout << ans;     } else       cout << s;     return 0;   }   