VOID
RtlInitUnicodeString(
  OUT PUNICODE_STRING DestinationString,
  IN  PCWSTR SourceString OPTIONAL
  );

Routine Description:

    The RtlInitUnicodeString function initializes an NT counted
    unicode string.  The DestinationString is initialized to point to
    the SourceString and the Length and MaximumLength fields of
    DestinationString are initialized to the length of the SourceString,
    which is zero if SourceString is not specified.

Arguments:

    DestinationString - Pointer to the counted string to initialize

    SourceString - Optional pointer to a null terminated unicode string that
        the counted string is to point to.


Return Value:

    None.