/tmp/ccj2M3C8.o: In function `judgeEnd':
judge.c:(.text+0x1ca): undefined reference to `showNext'
judge.c:(.text+0x206): undefined reference to `showNext'
/tmp/cc5k3rR5.o: In function `main':
main.c:(.text+0x119): undefined reference to `showNext'
main.c:(.text+0x40a): undefined reference to `showNext'
main.c:(.text+0x488): undefined reference to `showNext'
/tmp/cc5k3rR5.o:main.c:(.text+0x543): more undefined references to `showNext' follow
collect2: error: ld returned 1 exit status