add destructor for clean exit

inc/Memory.h

@@ -39,6 +39,8 @@ public:
   Memory(sc_module_name name, string filename);
   Memory(sc_module_name name, bool use_file);
 
+  ~Memory(void);
+  
   /**
    * @brief Returns Program Counter read from hexfile
    * @return Initial PC

src/Memory.cpp

@@ -31,6 +31,11 @@ Memory::Memory(sc_module_name name, bool use_file): sc_module(name)
     //memset(mem, 0, SIZE*sizeof(uint8_t));
   }
 
+  
+Memory::~Memory() {
+    delete mem;
+}
+
 uint32_t Memory::getPCfromHEX() {
   return program_counter;