#ifndef _NTRTL_H
#if (PHNT_VERSION >= PHNT_WINDOWS_10_20H1)

NTSYSAPI
VOID
NTAPI
RtlFreeUTF8String(
    _Inout_ _At_(Utf8String->Buffer, _Frees_ptr_opt_) PUTF8_STRING Utf8String
    );

#endif
#endif
View code on GitHub

// wdm.h

NTSYSAPI VOID RtlFreeUTF8String(
  PUTF8_STRING utf8String
);
View the official Windows Driver Kit DDI reference

NtDoc

This function is documented in Windows Driver Kit.

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Windows Driver Kit DDI reference (nf-wdm-rtlfreeutf8string)

RtlFreeUTF8String function

Description

The RtlFreeUTF8String function releases storage that was allocated by RtlUnicodeStringToUTF8String.

Parameters

`utf8String`

Pointer to the UTF8 string buffer previously allocated by RtlUnicodeStringToUTF8String.

Return value

Remarks

This routine only releases the UTF8 string buffer passed to it; it does not release the Unicode string buffer passed to RtlUnicodeStringToUTF8String.

RtlFreeUTF8String - NtDoc