Implemented all opcodes, including LOADI and STOREI

stack.cpp

@@ -1,12 +1,11 @@
 #include "stack.h"
 #include <stdlib.h>
 
-t_stack stack_new(const int size) {
-	t_stack stack;
+void stack_init(t_stack& stack, const int size) {
+	if (stack.data != nullptr) free(stack.data);
+	stack.data = (unsigned char*)malloc(size);
 	stack.max = size;
 	stack.top = -1;
-	stack.data = (unsigned char*)malloc(size);
-	return stack;
 }
 
 const bool stack_isempty(t_stack& stack) {