diff --git a/version0.1/nasal_var_stack.h b/version0.1/nasal_var_stack.h
deleted file mode 100644
index 6ea83b0..0000000
--- a/version0.1/nasal_var_stack.h
+++ /dev/null
@@ -1,121 +0,0 @@
-#ifndef __NASAL_VAR_STACK_H__
-#define __NASAL_VAR_STACK_H__
-
-#include "nasal_list.h"
-#include "nasal_print.h"
-
-
-namespace nasal
-{
-
-struct var_stack_unit
-{
-	std::string var_name;
-	var var_detail;
-	var_stack_unit *next;
-};
-
-class var_stack
-{
-	private:
-		var_stack_unit *head;
-	public:
-		var_stack()
-		{
-			head=new var_stack_unit;
-			head->var_name="null";
-			head->next=NULL;
-		}
-		~var_stack()
-		{
-			var_stack_unit *temp=head;
-			var_stack_unit *this_node=NULL;
-			if(head->next)
-			{
-				while(temp->next)
-				{
-					this_node=temp;
-					temp=temp->next;
-					delete this_node;
-				}
-				delete temp;
-			}
-			else
-				delete head;
-		}
-		void append_var(std::string &varia_name,var &temp_var)
-		{
-			var_stack_unit *temp=head;
-			while(temp->next)
-				temp=temp->next;
-			temp->next=new var_stack_unit;
-			temp=temp->next;
-			temp->var_name=varia_name;
-			temp->var_detail=temp_var;
-			temp->next=NULL;
-		}
-		void print_var()
-		{
-			var_stack_unit *temp=head;
-			while(temp->next)
-			{
-				temp=temp->next;
-				std::cout<<"["<<temp->var_detail.Type<<"]: "<<temp->var_name<<" : ";
-				if(temp->var_detail.Type!="string")
-					PrintVar(temp->var_detail);
-				else
-					std::cout<<*((std::string *)temp->var_detail.data);
-				std::cout<<std::endl;
-			}
-			return;
-		}
-		var SearchVar(std::string varia_name)
-		{
-			var temp_var;
-			temp_var.data=NULL;
-			temp_var.Type="null";
-			temp_var.isGlobal=false;
-			var_stack_unit *temp=head;
-			while(temp->next)
-			{
-				temp=temp->next;
-				if(temp->var_name==varia_name)
-					temp_var=temp->var_detail;
-			}
-			return temp_var;
-		}
-		void pop_var()
-		{
-			var_stack_unit *temp=head;
-			var_stack_unit *end_temp;
-			if(!head->next)
-				return;
-			while(temp->next)
-			{
-				end_temp=temp;
-				temp=temp->next;
-			}
-			end_temp->next=NULL;
-			delete temp;
-		}
-		void delete_all()
-		{
-			var_stack_unit *temp=head->next;
-			var_stack_unit *this_node=NULL;
-			head->next=NULL;
-			if(!temp)
-				return;
-			while(temp->next)
-			{
-				this_node=temp;
-				temp=temp->next;
-				delete this_node;
-			}
-			delete temp;
-			return;
-		}
-};
-
-}
-
-#endif