text: #include "lib.h"
  
  Item *Concatena(Item** ls, int ls_size) {
  
  	Item* latest_el = NULL;
  	Item* head = ls[0];
  
  	for (int i = 0; i < ls_size; i++) {
  
  		Item* current_list = ls[i];
  		// scorro tutte le liste e becco il loro ultimo elemento
  		if (i != 0) {
  			latest_el->next = current_list;
  		}
  		while (current_list) {
  
  			latest_el = current_list;
  			current_list = current_list->next;
  
  		}
  
  	}
  
  	return head;
  
  }