I have included a crate from the repository that will not resolve no matter what I have tried. Perhaps the repo crate is bad but I tried the code in another simple project without any problem. I'm mystified why it is unresolvable in this case.
crate::config will look for a module named config inside your crate. For an external crate you'll have to use just config. If that doesn't work, could you post the corresponding error?
use config::{Config};
That resolved the error. I think I had that before but the error didn't make that clear.