(12 XP) A function that checks if a string is a palindrome.

1. Fork this repository to your GitHub account.
2. Open solution file in Visual Studio.
3. Open file Checker.cs.
4. Implement the method IsPalindrome(string str) that checks if a string is a palindrome.
5. Run with CTRL+F5 to test it.
6. If all tests are passed, commit & sync your repository.
7. Send a link to your repository for Lab Master (in #slack) to check it.

IsPalindrome("oko") ➞ true
IsPalindrome("auto") ➞ false
IsPalindrome("testing") ➞ false
IsPalindrome("abcddcba") ➞ true

• A string is a palindrome when it is the same from the front and the back. (original string is equal to its reversed self)