/in/database.c: In function 'main':
/in/database.c:466:13: warning: implicit declaration of function 'gets'; did you mean 'fgets'? [-Wimplicit-function-declaration]
             gets(str);
             ^~~~
             fgets
/in/database.c:460:38: warning: variable 'thing' set but not used [-Wunused-but-set-variable]
         char *tablename, *filename, *thing, *course, *name, *deadline, *difficulty,*n;
                                      ^~~~~
In file included from /usr/include/stdio.h:862:0,
                 from /in/database.c:1:
In function 'fgets',
    inlined from 'main' at /in/database.c:536:21:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:260:9: warning: call to '__fgets_chk_warn' declared with attribute warning: fgets called with bigger size than length of destination buffer
  return __fgets_chk_warn (__s, __bos (__s), __n, __stream);
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/tmp/ccbcub39.o: In function `main':
database.c:(.text.startup+0xd6): warning: the `gets' function is dangerous and should not be used.