Write the method

StringBuilder square(int sideLength)

which returns a square of asterisks in one StringBuilder string.
You can make a line break inside a string with the character "\n", e.g.

System.out.println("aaa\nbbb");

prints:
aaa
bbb



Example method call:
public static void main(String[] args){
    System.out.println(square(3));
    System.out.println();

    StringBuilder largerSquare = square(6);
    System.out.println(largerSquare);
}

Program outputs:
***
***
***

******
******
******
******
******
******






import java.util.Random;

public class Test{
    public static void main(String[] args){
        final Random r = new Random();
        
        
        int[] p = {2,4,6,3};
        for (int pa : p) {
            System.out.println("Testing with parameter " + pa);
            StringBuilder square = square(pa);
            
            if (square.charAt(square.length() -1) == '\n') {
                square.deleteCharAt(square.length() -1);
            }
            System.out.println(square);
            System.out.println("");
        }
    }
    

    public static StringBuilder square(int sideLength) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < sideLength; i++) {
            for (int j = 0; j < sideLength; j++) {
                sb.append("*");
            }
            sb.append("\n");
        }
        return sb;
    }    



}








Testing with parameter 2
**
**

Testing with parameter 4
****
****
****
****

Testing with parameter 6
******
******
******
******
******
******

Testing with parameter 3
***
***
***