Found what I needed finally.. I now created a struct with this crate:
https://crates.io/crates/arraystring
That works for what I need, damn this has been annoying to find a solution too.
I can now store the strings I need in the struct, and use that in all the functions.
Also works with the GUI callback stuff, so it solves the Issue I’ve been having.
I have now added gui elements for server url, username, password.
And functions for fetching the timeline with the supplied info.
So now I can finally start working on the timeline GUI.
It’s been in a way easier then expected, but also somethings are a bit tricky.
I could easily have done the same in c++ much faster, but the whole point here was to learn more rust.
And for that it’s been going well.