[north, south, west, east] is [], but the first statement is of course, wrong.

What's up with the random tests? The char array in them is something like this '\u{2}', '\t', '\n', '\u{c}', '\r', '\u{e}'... instead of the alphabet, definetly doesn't seem like a valid input to me. I passed manual tests, but I think the random tests are broken(Rust).