The best practice is using string.IsNullOrWhiteSpace() method.

Yeah I'm wondering this too.

Thanks man! I've already knew why I'm wrong in some cases.

hi,

not an issue, just your code that is incorrect: those tests are called random tests for a reason... ;)

print the inputs, then debug your code.

cheers

I'm so frustrated with this Kata. Thought it was easy at first but then found out some tricky situations. But even after fixing them, whenever I click the "Attemp" button, the number of Passed and Failed cases kept changing. Like there're time they're 74 - 36, 72 - 38, 70 - 40, 80 - 30....