C:\test>cl /W3 GetFullPathName.c
Microsoft (R) C/C++ Optimizing Compiler Version 15.00.21022.08 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

GetFullPathName.c
Microsoft (R) Incremental Linker Version 9.00.21022.08
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:GetFullPathName.exe
GetFullPathName.obj

C:\test>GetFullPathName
"" -> C:\test\""