Function process_cut_data_mut 

pub fn process_cut_data_mut(
    data: &mut [u8],
    cfg: &CutConfig<'_>,
) -> Option<usize>

In-place cut processing for mutable data buffers. Returns Some(new_length) if in-place processing succeeded, None if not supported for the given configuration (caller should fall back to regular processing).

In-place avoids allocating intermediate output buffers — the result is written directly into the input buffer (output is always <= input for non-complement modes with default output delimiter).