Compilare: user.c: In function ‘element’: user.c:46:3: warning: implicit declaration of function ‘strdup’ [-Wimplicit-function-declaration] no_spaces=strdup(aux);//alocam spatiu pt no spaces; ^ user.c:46:12: warning: assignment makes pointer from integer without a cast [enabled by default] no_spaces=strdup(aux);//alocam spatiu pt no spaces; ^ user.c:17:8: warning: variable ‘no_spaces’ set but not used [-Wunused-but-set-variable] char *no_spaces;//no spaces va fi returnat ^ user.c: In function ‘write’: user.c:58:6: warning: unused variable ‘i’ [-Wunused-variable] int i , j; ^ user.c: In function ‘main’: user.c:156:14: warning: assignment makes pointer from integer without a cast [enabled by default] categ[n]=strdup(aux); ^