Given a string determine if it's a palindrome. Ignore case and include only alphanumeric characters (no punctuation or diacritical marks).

Palindrome

def rev(str)
	a = 0
	
	reverse = ""

	while a < str.length
		reverse = str[a] + reverse

		a += 1

	end

	puts "#{str} backwards is #{reverse}."
	
	if reverse == str
	  puts "#{reverse} is a palindrome."
	else 
	  puts "#{reverse} is not a palindrome."
	end 
	
end

puts rev("dogs")
puts rev("reciprocity")