pset2 vigenere check50 returns \ expected output, but not "a'*u001\n"

Question

My code passes all of the checks except "for encrypts a as a using a as keyword."

When I run the program and enter "a" for the plaintext and "a" as the keyword it returns "a" as expected. But when I run check50 I get a sad face saying "expected output, but not "a'*u001\n"

I searched around and I couldn't find out what this means. Can anybody provide some guidance?

Answer 1

It means that you are actually returning a plus an unprintable char then your newline character. So you are writing an extra char. Check your loop conditions again.