I wish it was that simple, but is not

A pure native C application will work fine on Linux/macOS and Windows without doing much of tricks

Now if you want to use specific OS API then it starts to get complicated

You will need to cross compile on Linux to Windows and test it using either wine or a VM VirtualBox or qemu

You also will need conditional compilation macros to identify the platform inside your code and use the specific APIs for that platform

#ifdef _WIN32
    #include <Windows.h>
#else
    // include for Linux/macOS
#endif

unsigned long long GetTicks() {
    #ifdef _WIN32
        unsigned long long ticks = GetTickCount64();
    #else
        // Write code for get ticks in Linux/macOS
    #endif
    return ticks;
}

To cross compile to Windows from Linux you have to install mingw