Java Taskbook Level 4.8

Given a string of letters:

String str = "Aaa Bbb Ccc';

Please make sure that this line does not contain more than two capital letters.

The date is given in the following format:

String str = "2025-12-31';

Convert this date to the following array:

String[] {"31", "12", "2025"}

There is a certain line with the words:

"aaa bbb ccc"

Capitalize the first character of each word in this line. In our case, it should look like this:

"Aaa Bbb Ccc"

Given an array of characters:

char[] arr = {'a', 'b', 'c', 'd', 'e', 'f'};

Merge these characters in pairs as strings:

String[] {"ab", "cd", "ef"}