added and fixed stack

interpreter/test/Makefile

@@ -0,0 +1,12 @@
+CC=gcc
+
+all: test_stack
+
+stack: clean
+	$(CC) -g ../stack.c test_stack.c -o stack
+
+test_stack: stack
+	valgrind ./stack
+
+clean:
+	-rm stack

interpreter/test/test_stack.c

@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include "../stack.h"
+
+int main(void)
+{
+	bci_stack_t stack = NULL;
+	int i;
+	uint16_t res;
+	char status = 0;
+
+
+	for(i = 0; i < 10; i++)
+	{
+		bci_stack_t_push(&stack, (uint16_t) i);
+	}
+	while(!status)
+	{
+		status = bci_stack_t_pop(&stack, &res);
+		printf("%d\n", res);
+	}
+
+
+	for(i = 0; i < 10; i++)
+	{
+		bci_stack_t_push(&stack, (uint16_t) i);
+	}
+	bci_stack_t_del(&stack);
+	return 0;
+}