Rust Taskbook Level 2.8

Задание 1

Given an array of strings:

rustlet arr: [&str; 3] = ["ab", "cd", "ef"];

Get an array of characters from these strings:

rust['a', 'b', 'c', 'd', 'e', 'f']

Задание 2

Given an integer containing a month number from 1 to 12:

rustlet num: u8 = 1;

Print the name of the month corresponding to this date.

Задание 3

Given a line:

rustlet txt: &str = "12345";

Get the first and last character of this string as follows:

rust"15"

Задание 4

Given variables containing the sides of a rectangle:

rustlet a: i16 = 10;
let b: i16 = 20;

Get the area and perimeter of this rectangle.