def prepare
import bend-collections-laws-crypto@1.0.0.0/spec/crypto/blake/blake2b.bend as Blake2bimport Base
226def prepare(last: Bool, ws: List<&2,U32>, remain: Nat) -> List<&2,U32>:
227 match last:
228 case False{}: ws
229 case True{}: trim(ws,0n,remain)