error C2365: 'GetModuleFileNameW': redefinition; previous definition was 'function'

#include <windows.h>
#include <bcrypt.h>
 
#define BUFFER_SIZE 1024
#define MD5_LENGTH 16
 
BCRYPT_ALG_HANDLE hAlg = NULL;
BCRYPT_HASH_HANDLE hHash = NULL;
 
PBYTE hashObject = NULL;
 
ULONG bytesRead = 0;
DWORD hashObjectSize = 0;
 
BYTE hash[MD5_LENGTH] = { 0 };
DWORD hashLength = MD5_LENGTH;
 
TCHAR fileName[MAX_PATH] = { 0 };
GetModuleFileName(NULL, fileName, MAX_PATH);
 
HANDLE hFile = CreateFile(fileName, GENERIC_READ,
    FILE_SHARE_READ, NULL,
    OPEN_EXISTING,
    FILE_ATTRIBUTE_NORMAL, NULL);
 
BCryptOpenAlgorithmProvider(&hAlg, BCRYPT_MD5_ALGORITHM, NULL, 0);
BCryptGetProperty(hAlg, BCRYPT_OBJECT_LENGTH,
    (PBYTE)&hashObjectSize, sizeof(DWORD),
    &bytesRead, 0);
 
hashObject = (PBYTE)HeapAlloc(GetProcessHeap(), 0, hashObjectSize);
 
BCryptCreateHash(hAlg, &hHash, hashObject, hashObjectSize, NULL, 0, 0);
 
BOOL readRes = FALSE;
BYTE buffer[BUFFER_SIZE] = { 0 };
 
do
{
    readRes = ReadFile(hFile, buffer, BUFFER_SIZE, &bytesRead, NULL);
 
    if (bytesRead == 0)
    {
        break;
    }
 
    BCryptHashData(hHash, buffer, bytesRead, 0);
} while (readRes);
 
BCryptFinishHash(hHash, hash, hashLength, 0);
 
BYTE storedHash[MD5_LENGTH] = { 0 };
 
GetStoredFileHash(storedHash, hashLength);
 
SIZE_T hashCmpRes = RtlCompareMemory(hash, storedHash, hashLength);
 
if (hashCmpRes == hashLength)
{
    printf("Integrity check success\n");
}
 
else
{
    printf("Integrity check failed\n");
}
 
BCryptDestroyHash(hHash);
BCryptCloseAlgorithmProvider(hAlg, 0);
HeapFree(GetProcessHeap(), 0, hashObject);
CloseHandle(hFile);

GetModuleFileName(NULL, fileName, MAX_PATH); //ошибка C2365!
void MyClass::MyMethod()
{
........................  
  GetModuleFileName(NULL, fileName, MAX_PATH); //никакой ошибки!
........................
}

WINBASEAPI //DECLSPEC_IMPORT -> __declspec(dllimport)
_Success_(return != 0) //_SAL2_Source_(_Success_, (expr), _Success_impl_(expr)) -> _SA_annotes3(SAL_name, #Name, "", "2") _Group_(annotes _SAL_nop_impl_)
_Ret_range_(1, nSize) //_SAL2_Source_(_Ret_range_, (lb,ub), _Ret_range_impl_(lb,ub)) -> ...
DWORD
WINAPI
GetModuleFileNameW(
    _In_opt_ HMODULE hModule,
    _Out_writes_to_(nSize, ((return < nSize) ? (return + 1) : nSize)) LPWSTR lpFilename,
    _In_ DWORD nSize
    );

using namespace std::chrono;