package main

import (
	"fmt"
	"log"
	"os"
	"strconv"
)

type Shaper interface {
	Shape(int) Square
}

type Square struct {
	form     string
	quantity int
}

func (s Square) Shape(num int) Square {
	for i := 0; i < num; i++ {
		for i := 0; i < num; i++ {
			s.form += "* "
		}
		s.form += "\n"
	}

	s.quantity = num
	return s
}

func showShape(s Shaper, num int) {
	fmt.Println(s.Shape(num).form)
}

func getNumberStars() int {
	numStr := os.Args[1]
	num, err := strconv.Atoi(numStr)
	if err != nil {
		log.Panicln(err)
	}
	return num
}

func main() {
	s := Square{}
	showShape(s, getNumberStars())
}