C:\Users\ADMINI~1\AppData\Local\Temp\2\ccNZNZQD.o:src.c:(.text 0x34): undefined reference to `f'
C:\Users\ADMINI~1\AppData\Local\Temp\2\ccNZNZQD.o:src.c:(.text 0x67): undefined reference to `f'
collect2.exe: error: ld returned 1 exit status