diff --git a/version0.1/nasal_func_stack.h b/version0.1/nasal_func_stack.h
deleted file mode 100644
index a48d2a8..0000000
--- a/version0.1/nasal_func_stack.h
+++ /dev/null
@@ -1,124 +0,0 @@
-#ifndef __NASAL_FUNC_STACK_H__
-#define __NASAL_FUNC_STACK_H__
-
-#include "nasal_func.h"
-
-
-namespace nasal
-{
-
-struct func_stack_unit
-{
-	std::string func_name;
-	func func_statement;
-	func_stack_unit *next;
-};
-
-class func_stack
-{
-	private:
-		func_stack_unit *head;
-	public:
-		func_stack()
-		{
-			head=new func_stack_unit;
-			head->func_name="null";
-			head->next=NULL;
-		}
-		~func_stack()
-		{
-			func_stack_unit *temp=head;
-			func_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_function(std::string &function_name,func &temp_func)
-		{
-			func_stack_unit *temp=head;
-			while(temp->next)
-			{
-				temp=temp->next;
-				if(temp->func_name==function_name)
-				{
-					std::cout<<"[Error] Redeclaration of function \""<<function_name<<"\""<<std::endl;
-					return;
-				}
-			}
-			temp->next=new func_stack_unit;
-			temp=temp->next;
-			temp->next=NULL;
-			temp->func_statement=temp_func;
-			return;
-		}
-		void run_function(std::string &function_name)
-		{
-			func_stack_unit *temp=head;
-			while(temp->next)
-			{
-				temp=temp->next;
-				if(temp->func_name==function_name)
-				{
-					temp->func_statement.run();
-					return;
-				}
-			}
-			std::cout<<"[Error] Could not find this function."<<std::endl;
-			return;
-		}
-		void print_function()
-		{
-			func_stack_unit *temp=head;
-			while(temp->next)
-			{
-				temp=temp->next;
-				std::cout<<"function: "<<temp->func_name<<std::endl;
-			}
-			std::cout<<"function: "<<temp->func_name<<std::endl;
-			return;
-		}
-		void pop_function()
-		{
-			func_stack_unit *temp=head;
-			func_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()
-		{
-			func_stack_unit *temp=head->next;
-			func_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