Compilare: user.c: In function ‘main’: user.c:35:25: warning: implicit declaration of function ‘strdup’ [-Wimplicit-function-declaration] token[s] = strdup (aux); ^ user.c:35:34: warning: assignment makes pointer from integer without a cast [enabled by default] token[s] = strdup (aux); ^ user.c:57:46: warning: assignment makes pointer from integer without a cast [enabled by default] token[s] = strdup (aux); ^ user.c:71:22: warning: assignment makes pointer from integer without a cast [enabled by default] token[s] = strdup (aux); ^