usebase64::engine::general_purpose::STANDARDasBASE64_STANDARD;usebase64::Engine;usesuper::constants::BLOCK_ID_WIDTH;/// Builds a stable Azure block id from a zero-based block index.
pubfnblock_id_by_index(index:usize)-> String{BASE64_STANDARD.encode(format!("{index:0BLOCK_ID_WIDTH$}"))}