Update implemented toString function

CM2005 Object Oriented Programming/Topic 5/5.1.5/Wallet.cpp

@@ -0,0 +1,21 @@
+#include "Wallet.h"
+
+Wallet::Wallet()
+{
+
+}
+
+void Wallet::insertCurrency(std::string type, double amount)
+{
+
+}
+
+bool Wallet::containsCurrency(std::string type, double amount)
+{
+  return false;
+}
+
+std::string Wallet::toString()
+{
+  return "Oink!";
+}