DirExists reports whether the dir exists as a boolean, taken from https://stackoverflow.com/a/49697453 / https://stackoverflow.com/a/51870143/3337885.

ExtractHost takes a "IP:Port" formatted string and returns the ip portion.

ExtractPort takes a "IP:Port" formatted string and returns the port as integer.

GenerateGarbageString produces a string (length is randomly chosen between 1 and `n`) consisting of random (non)-printable characters.

GeneratePseudoEmptyString creates a string that looks empty when printed in a terminal.

Mkdirs creates the given directory.

from https://stackoverflow.com/a/37897238/3337885.

SplitHostPort takes a "IP:Port" formatted string and returns the port as integer and the ip portion as string.

StringSliceDifference returns the elements in `a` that aren't in `b`.