fin03_err_msg

miku@DESKTOP-HLSSCVT:~$ cd Final
miku@DESKTOP-HLSSCVT:~/Final$ cd P3
miku@DESKTOP-HLSSCVT:~/Final/P3$ ls
a.out  fin03.c  linuxlist.h  makefile  schedule.c  schedule.h
miku@DESKTOP-HLSSCVT:~/Final/P3$ make
gcc fin03.c schedule.c -lm -o fin03
In file included from schedule.h:4,
                 from schedule.c:5:
linuxlist.h:99: warning: "offsetof" redefined
   99 | #define offsetof(TYPE, MEMBER) ((size_t)&((TYPE *)0)->MEMBER)
      |
In file included from schedule.c:2:
/usr/lib/gcc/x86_64-linux-gnu/9/include/stddef.h:406: note: this is the location of the previous definition
  406 | #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
      |
/usr/bin/ld: /tmp/ccYS8x4M.o: in function `main':
schedule.c:(.text+0x3d6): multiple definition of `main'; /tmp/ccjABz2N.o:fin03.c:(.text+0x6d7): first defined here
collect2: error: ld returned 1 exit status
make: *** [makefile:2: all] Error 1