added an is_empty function to the stack.

README.md

@@ -11,11 +11,18 @@ A handy collection of C algorithms compiled into one header file for use anywher
 
 ### Functions
 ```c
+//Creates new stack.
 void new();
+//Frees stack memory.
 void free(Stack *s);
+//Pushes item to top of the stack.
 void push(item, Stack *s);
+//Removes item on top of the stack and returns it.
 item pop(Stack *s);
+//Prints stack size, memory usage.
 void print(Stack s);
+//Returns 1 if empty stack, 0 otherwise.
+int is_empty(Stack s);
 ```
 
 ### Description

source/handystack.h

@@ -114,4 +114,12 @@ void TEMPLATE(print,STACK_CONTAINER)(STACK_CONTAINER s){
 	printf("\tStack: \tItems: %d, Allocated Size: %d, Bytes used: %lu\n", s.top, s.size, s.size*sizeof(STACK_TYPE));
 }
 
+/*
+Stack check Empty:
+	returns 1 if the stack is empty, false if there is at least one item.
+*/
+int TEMPLATE(is_empty,STACK_CONTAINER)(STACK_CONTAINER s){
+	return (s.top == 0);
+}
+
 #endif