func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long N = 1234567;   const long long MOD = 998244353;   void solve() {     long long n, m, i, j = 0, k, l = 0, ok = 0, o = 0, p, ans = 0, x, y, a[30];     string s;     cin >> n >> k >> s;     for (long long i = 0; i < k / 2; i++) {       map<char, long long> mg;       for (j = 0; j < n; j += k) {         mg[s[i + j]]++;         mg[s[j + k - i - 1]]++;       }       l = 0;       for (auto it : mg) l = max(l, it.second);       ans += l;     }     if (k % 2) {       map<char, long long> mg;       for (j = 0; j < n; j += k) {         mg[s[j + k / 2]]++;       }       l = 0;       for (auto it : mg) l = max(l, it.second);       ans += l;     }     cout << (n - ans) << endl;   }   int32_t main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     long long t;     cin >> t;     while (t--) solve();     return 0;   }   