#ifndef _NTRTL_H

/**
 * The RtlEqualUnicodeString routine compares two Unicode strings to determine whether they are equal.
 *
 * \param[in] String1 Pointer to the first Unicode string.
 * \param[in] String2 Pointer to the second Unicode string.
 * \param[in] CaseInSensitive If TRUE, case should be ignored when doing the comparison.
 * \return TRUE if the two Unicode strings are equal; otherwise, it returns FALSE.
 * \sa https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/wdm/nf-wdm-rtlequalunicodestring
 */
_Must_inspect_result_
NTSYSAPI
BOOLEAN
NTAPI
RtlEqualUnicodeString(
    _In_ PCUNICODE_STRING String1,
    _In_ PCUNICODE_STRING String2,
    _In_ BOOLEAN CaseInSensitive
    );

#endif
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// wdm.h

NTSYSAPI BOOLEAN RtlEqualUnicodeString(
  [in] PCUNICODE_STRING String1,
  [in] PCUNICODE_STRING String2,
  [in] BOOLEAN          CaseInSensitive
);
View the official Windows Driver Kit DDI reference