Thank you!

I'm solving this kata in C#. My solution is passing every test except testShould_correctly_multiply_any_two_non_negative_integers_together_for_products_up_to_and_including_255.

I get past the first 6 assertions in that test, but the 7th fails. The error says it's expecting an empty string, but I'm returning a "œ".

From what I can tell by debugging a "œ" does represent the correct result of multiplying the two numbers I'm given as input, so I don't know why my output is incorrect. Also I'm surprised that the output is expected to be an empty string when it seems logical that a multiplication problem should have an answer.

What am I missing? Any help would be appriciated.