Compilare: user.c: In function ‘main’: user.c:157:5: warning: passing argument 1 of ‘strcpy’ makes pointer from integer without a cast [enabled by default] strcpy (aux, s + i + 1); ^ In file included from /usr/include/features.h:357:0, from /usr/include/stdio.h:28, from user.c:1: /usr/include/i386-linux-gnu/bits/string3.h:103:1: note: expected ‘char * restrict’ but argument is of type ‘char’ __NTH (strcpy (char *__restrict __dest, __const char *__restrict __src)) ^