pub fn combine_lo_hi_openings(
opening_lo: &PedersenOpening,
opening_hi: &PedersenOpening,
bit_length: usize,
) -> PedersenOpening
pub fn combine_lo_hi_openings(
opening_lo: &PedersenOpening,
opening_hi: &PedersenOpening,
bit_length: usize,
) -> PedersenOpening