#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
#define endl "\n"

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int t; cin >> t;
    for (int k = 0; k < t; ++k) {
        ll n, m; cin >> n >> m;
        vector <vector<char>> a(n, vector <char> (m));
        for (int i = 0; i < n; ++i) {
            for (int j = 0; j < m; ++j) {
                cin >> a[i][j];
            }
        }
        for (int i = 0; i < m; ++i) {
            ll cnt = 0;
            for (int j = 0; j < n; ++j) {
                if (a[j][i] == '*'){
                    cnt++;
                    a[j][i] = '.';
                }
                else if (a[j][i] == 'o'){
                    ll c = j - 1;
                    while (cnt > 0){
                        a[c][i] = '*';
                        c--;
                        cnt--;
                    }
                }
                if (j == n - 1){
                    ll c = j;
                    while (cnt > 0){
                        a[c][i] = '*';
                        c--;
                        cnt--;
                    }
                }
            }
        }
        for (int i = 0; i < n; ++i) {
            for (int j = 0; j < m; ++j) {
                cout << a[i][j];
            }
            cout << endl;
        }
        cout << endl;
    }
    return 0;
}