Compilare: user.c: In function 'strtok2': user.c:18: warning: implicit declaration of function 'strspn' user.c:18: warning: incompatible implicit declaration of built-in function 'strspn' user.c:19: warning: implicit declaration of function 'strcspn' user.c:19: warning: incompatible implicit declaration of built-in function 'strcspn' user.c: In function 'main': user.c:48: warning: implicit declaration of function 'strtok' user.c:48: warning: assignment makes pointer from integer without a cast user.c:53: warning: assignment makes pointer from integer without a cast /tmp/ccWMyyPV.o: In function `main': user.c:(.text+0xe4): warning: the `gets' function is dangerous and should not be used.