struct user {
   string username;
   string password;
};

user *init_user(const string & username, const string & password){
    user *u = (user *)malloc(sizeof(user));
    if (u == NULL){
        return NULL;
    }
    u->username = username;
    u->password = password;
    return u;
 }

u->username = username;
u->password = password;

user *init_user(const string & username, const string & password) {
    user* u = new user;
    u->username = username;
    u->password = password;
    return u;
}