Rust Taskbook Level 10.9

Given a file with text. Find the most frequently used symbol of this text and output it into a paragraph.

Write a code that will generate a password of a given size. The password must contain a lowercase and uppercase letter, a number, and some special symbol.

Given a string containing a fraction:

"12/16"

Write a code that will describe the process of reducing a fraction, like in school:

"12/16 = 6/8 = 3/4"

Given an arbitrary two-dimensional array:

[
	[11, 12, 13, 14, 15],
	[21, 22, 23, 24, 25],
	[31, 32, 33, 34, 35],
	[41, 42, 43, 44, 45],
	[51, 52, 53, 54, 55],
}

Swap the two given columns:

[
	[11, 15, 13, 14, 12],
	[21, 25, 23, 24, 22],
	[31, 35, 33, 34, 32],
	[41, 45, 43, 44, 42],
	[51, 55, 53, 54, 52],
}