Function set_remainder_bits 

fn set_remainder_bits(
    start_remainder_mut_slice: &mut [u8],
    rem: u64,
    remainder_len: usize,
)

Write remainder bits back to buffer while preserving bits outside the range.

This function carefully updates only the specified bits, leaving all other bits in the affected bytes unchanged.

Arguments

• start_remainder_mut_slice - the slice of bytes to write the remainder bits to, the length must be equal to ceil(remainder_len, 8)
• rem - The result bits to write
• remainder_len - Number of bits to write