package org.example;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;
public class Main {
public static void main(String[] args) throws IOException {
BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
int num = Integer.parseInt(bf.readLine());
for (int i = 0; i < num; i++) {
String s = bf.readLine();
String[] string = s.split(" ");
int count = Integer.parseInt(string[0]);
String[] stringList = string[1].split("");
String str = "";
StringBuilder sb = new StringBuilder();
for (int k = 0; k < stringList.length; k++) {
for (int j = count; j > 0; j--) {
str += stringList[k];
}
}
System.out.println(str);
}
}
}
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