Rust Taskbook Level 5.9

Display the following pyramid on the screen:

xx
xxxx
xxxxxx
xxxxxxxx
xxxxxxxxxx

Make an array of size 10 by 10. Fill it with numbers in order:

[
	[ 1,  2,  3,  4,  5],
	[ 6,  7,  8,  9, 10],
	[11, 12, 13, 14, 15],
	[16, 17, 18, 19, 20],
	[21, 22, 23, 24, 25],
}

Given a number:

let num: u16 = 12345;

Double the digits in this number:

1122334455

Given an array:

[
	"123",
	"213",
	"321",
}

Replace the characters "1" with "0" in each line:

[
	"023",
	"203",
	"320",
}