#include <stdio.h>
#include <stdlib.h>
/* This is a template with the functions you must implement for this assignment.
 *
 * Note that you are free to implement any additional function you consider appropriate.
 *
 */
struct stack_value{
	char value;
	struct stack_value *next;
};
struct stack_value *Head = NULL;


// push a character into the stack
void stack_push(char c){
	printf("beginning\n");
	struct stack_value *temp = malloc(sizeof(struct stack_value));

	temp->value = c;
	temp->next = Head;
	Head = temp;
	printf("%i\n",c );
	printf("end\n");
}

/* Overwrites the character pointed by c with the character currently on
 * top of the stack.
 *
 * The function returns 0 if the operation can be carried out successfully,
 * and any non-zero number if the operation could not be performed (for instance
 * because the stack is empty).
 */
int stack_top(char *c){
if(Head == NULL)
return 1;

else{
*c = (Head->next)->value;
printf("%i\n",*c );
return 0;
}
}


/* Overwrites the character pointed by c with the character currently on
 * top of the stack, and removes the character from the top of the stack.
 *
 * The function returns 0 if the operation can be carried out successfully,
 * and any non-zero number if the operation could not be performed (for instance
 * because the stack is empty).
 */
int stack_pop(char *c){
if(Head == NULL)
return 1;

*c = (Head->next)->value;
struct stack_value *temp;
temp = Head;
Head = Head->next;
return 0;
}



/* Returns a dynamically allocated string (in the heap)
 * containing the characters in the string pointed by source,
 * excluding any one-line comment.
 */
char *remove_single_line_comment(const char *source){}


/* Returns a dynamically allocated string (in the heap)
 * containing the characters in the string pointed by source,
 * excluding any multi-line comment.
 */
char *remove_multi_line_comment(const char *source){}


/* The main function of your program. Rename into mymain
 * for testing.
 */
int mymain(int argc, char **argv) {

	//the code of your main function goes here.

	return 0;
}