Test for ISBN Verifier exercise

Exploring community solutions of this exercise I found this solution that completely ignores invalid characters. This is because all the test that has invalid characters, also has a invalid ISBN. So I think it will be good to add a test that has a valid ISBN with invalid characters, like this one:

fn valid_isbn_with_invalid_characters() {

See [ISBN Verifier] Need one more test - #8 by IsaacG

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Thanks Isaac. Iā€™m only subscribed to the Rust topic, so I missed that other thread. (feel free to ping me about Rust stuff in other topics)

sync PR