LRESULT CALLBACK WndProc(HWND hwnd, UNIT message, WPARAM wParam, LPARAM lPARAM);

위에서 가로가 없다고 에러가뜨네요..
C:Program FilesMicrosoft Visual StudioMyProjectsPractice1_1practice1_1.c(3) : error C2146: syntax error : missing ')' before identifier 'message'