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struct node {  void *item;  struct node *next;};typedef struct node *NODEPTR;void *m_alloc(void *tmp, int n){    tmp = (void *)malloc(n);  if (tmp == NULL) {    fprintf(stderr, "ERRORE: memoria insufficiente.\n");    exit (1);  }  return (tmp);}    void *find_end(void *lista){void *tmp;	tmp=lista;	while (tmp->next!=NULL) {		tmp=tmp->next;	}return tmp;}