A brainfrick interpreter written in safe rust
The main entry point is the eval_string function
```rust use brainfrsck::prelude::eval_string;
let sum = r#",>,[[-<+>],]<."#;
asserteq!(
evalstring(sum, Some(vec![1,2,3,4,5,6]))?.to_vec()[0],
(0u8..=6).sum::
```
eval_string returns an InterpreterOutput which is essentially a wrapper for a Vec<u8>, it has methods to convert to a String (to_string) and to get the internal Vec (to_vec), as well as Debug writing the Vec and Display writing the String