Compilare: user.cpp: In function ‘char* cpy(char*)’: user.cpp:22:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘char* mlty(char*, char*)’: user.cpp:101:45: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(i=1;i<=b[0];i++)add_ud(&c,mlty(a,b[i],i-1)); ^ user.cpp:99:16: warning: unused variable ‘aux’ [-Wunused-variable] char *c,i,*aux; ^