Write a program that checks whether input is a palindrome or not.
Example method call:
is_palindrome?('maddam') # => true
is_palindrome?("a man a plan a canal panama") # => true
is_palindrome?('i'm the goddamn batman') # => false
Write is_palindrome? into a ruby String method. (Monkeypatching)
This means you can call this method directly on a string instead of passing the string into the function.
"maddam".is_palindrome? # => true
"a man a plan a canal panama".is_palindrome? # => "true"
"i'm the goddamn batman".is_palindrome? # => false