[M-8] Write a program that generates
and prints N lines of N characters. The characters are randomly chosen dots
and stars. Make about 1 character out of 13 a star. Typical output is:
*..............*.......* *.........*............. ...........*...**....... ........................ .*.........*............ ...........*............ ............*..*........ ..............**.....*.. ...*.................... .....*.................. .......................* .............*.......... .........*....*......... ............*........... ........*.*.......*....* ..................*..... ..................*..... ......**...........*.... ......*.......*....*.... ......*......*.......... ..............*.....*... .......................* ..*..*.................. ....*...................