diff --git a/src/08_PTRN/Testat/BankAccount.cpp b/src/08_PTRN/Testat/BankAccount.cpp
index bb970d7..d37fd23 100644
--- a/src/08_PTRN/Testat/BankAccount.cpp
+++ b/src/08_PTRN/Testat/BankAccount.cpp
@@ -8,6 +8,7 @@ this->owner = owner;
 BankAccount * BankAccount::operator+(Money * money) {
 
     BankAccount::money = new Money(money->getValue() + getMoney().getValue());
+    
     return this;
 }
 
diff --git a/src/08_PTRN/Testat/main.cpp b/src/08_PTRN/Testat/main.cpp
index 6438d40..d00905a 100644
--- a/src/08_PTRN/Testat/main.cpp
+++ b/src/08_PTRN/Testat/main.cpp
@@ -94,7 +94,8 @@ int main(int argc, char **argv) {
                     *bankAccount + coin;
                 }
 
-                Money * fee = * bankAccount - 10;
+                Money * fee = *bankAccount - 10;
+                delete fee;
             }
             std::cout << *bankAccount << std::endl;
         }
diff --git a/src/10_PITF/Testat/Bill.cpp b/src/10_PITF/Testat/Bill.cpp
index 5bf83a9..49a5d3e 100644
--- a/src/10_PITF/Testat/Bill.cpp
+++ b/src/10_PITF/Testat/Bill.cpp
@@ -4,7 +4,7 @@
 
 using namespace banking;
 
-Bill::Bill(int value, Currency currency, std::string serial) : Cash(value, currency), serial(std::move(serial)){
+Bill::Bill(int value, Currency currency, std::string &serial) : Cash(value, currency), serial(std::move(serial)){
 
 }
 
diff --git a/src/10_PITF/Testat/Bill.h b/src/10_PITF/Testat/Bill.h
index f3e82c5..35be3d5 100644
--- a/src/10_PITF/Testat/Bill.h
+++ b/src/10_PITF/Testat/Bill.h
@@ -18,7 +18,7 @@ namespace banking {
     private:
         std::string serial;
     public:
-        explicit Bill(int value, Currency currency, std::string serial);
+        explicit Bill(int value, Currency currency, std::string &serial);
         explicit Bill(Bill *bill);
         std::string getSerial();
         int getValue() override;
diff --git a/src/10_PITF/Testat/HeapObject.cpp b/src/10_PITF/Testat/HeapObject.cpp
index 625b16f..07d8fd5 100644
--- a/src/10_PITF/Testat/HeapObject.cpp
+++ b/src/10_PITF/Testat/HeapObject.cpp
@@ -22,8 +22,6 @@ HeapObject::~HeapObject(){
 
 bool HeapObject::assertionsHold() {
     //assert(ctorCount == newCount);   // all objects have been allocated on heap
-    std::cout << std::endl;
-    std::cout << ctorCount << " " << dtorCount << std::endl;
     assert(ctorCount == dtorCount);  // all objects have been deleted
     return true;
 }
\ No newline at end of file
diff --git a/src/10_PITF/Testat/main.cpp b/src/10_PITF/Testat/main.cpp
index 4935978..fb71e3c 100644
--- a/src/10_PITF/Testat/main.cpp
+++ b/src/10_PITF/Testat/main.cpp
@@ -35,17 +35,17 @@ std::ostream &operator<<(std::ostream &os, Cash cash) {
     return os;
 }
 
-std::ostream &operator<<(std::ostream &os, std::shared_ptr<Money> money) {
+std::ostream &operator<<(std::ostream &os, const std::shared_ptr<Money> &money) {
     os << money->getValue() << " " << money->getCurrency();
     return os;
 }
 
-std::ostream &operator<<(std::ostream &os, std::shared_ptr<Person> person) {
+std::ostream &operator<<(std::ostream &os, const std::shared_ptr<Person> &person) {
     os << person->getName();
     return os;
 }
 
-std::ostream &operator<<(std::ostream &os, std::shared_ptr<BankAccount> bankAccount) {
+std::ostream &operator<<(std::ostream &os, const std::shared_ptr<BankAccount> &bankAccount) {
     os << bankAccount->getOwner() << " " << bankAccount->getName() << ": " << bankAccount->getMoney();
     return os;
 }