Function align_to_byte 

fn align_to_byte<F>(
    buffer: &mut [u8],
    op: &mut F,
    offset_in_bits: usize,
    remaining_len_in_bits: usize,
)
where
    F: FnMut(u64) -> u64,

Align to byte boundary by applying operation to bits before the next byte boundary.

This function handles non-byte-aligned operations by processing bits from the current position up to the next byte boundary, while preserving all other bits in the byte.

Arguments

• op - Unary operation to apply
• buffer - The mutable buffer to modify
• offset_in_bits - Starting bit offset (not byte-aligned)
• remaining_len_in_bits - Number of bits still to process starting at offset_in_bits. When this is smaller than the number of bits left in the byte, the trailing bits of the byte are left untouched.