ion(s) violated: str::get_unchecked requires that the range is within the string slice

This indicates a bug in the program. This Undefined Behavior check is optional, and cannot be relied on for safety.called `Result::unwrap()` on an `Err` valueunsafe precondition(s) violated: slice::get_unchecked requires that the index is within the slice

This indicates a bug in the program. This Undefined Behavior check is optional, and cannot be relied on for safety.