Rust Taskbook Level 7.10

Make a function that will take a letter as a parameter and check whether it is a Cyrillic or Latin letter.

Make a function that takes a letter as a parameter and checks whether it is an uppercase or lowercase letter.

Make a function that takes an array as a parameter and shuffles the elements of this array in a random order.

Create a function that takes a string of words as a parameter and returns a string consisting of the first letters of those words converted to uppercase.