String Extension

method ToHexString(aSpacer: String; aBytesPerLine: Int32): not nullable String

String! ToHexString(String aSpacer, Int32 aBytesPerLine)

func ToHexString(_ aSpacer: String, _ aBytesPerLine: Int32) -> String

Function ToHexString(aSpacer As String, aBytesPerLine As Int32) As String