Function unc_stdx::split_array_mut

pub fn split_array_mut<const N: usize, const L: usize, const R: usize>(
    xs: &mut [u8; N]
) -> (&mut [u8; L], &mut [u8; R])

Splits &mut [u8; L + R] into (&mut [u8; L], &mut [u8; R]).