Be aware that the stack space here can become huge for bigints. It's a better practice to use tail recursion for constant stack space.

The solution here is simple, but these test cases test the side effects of this function and not an actual return value, how you'd expect in a proper test scenario.

I'm not sure how to manipulate the global values from the test case in python.

Imagine someone is having two last names like it's normal in hispanic cultures. The code only works within the limitations of the exercise requirements.

I'd not approve the code review though ;)

Just realised that the lower_chars list is completly unnecessary. I could have iterated through ascii_lowercase directly.

1337

cleanest solution