import * as mod from "https://deno.land/std@0.42.0/bytes/mod.ts"; FunctionsfconcatConcatenate two binary arrays and return new one fequalCheck whether binary arrays are equal to each other * ffindIndexFind first index of binary pattern from a. If not found, then return -1 * ffindLastIndexFind last index of binary pattern from a. If not found, then return -1 * fhasPrefixCheck whether binary array has binary prefix * frepeatRepeat bytes. returns a new byte slice consisting of count copies of b.