Everybody loves sri

#include <stdio.h>#include <stdlib.h>typedef struct _List List;struct _List {		List *next;	void *data;	};typedef struct {	List *head;	List *tail;	} QUEUE;static inline QUEUE *queue_new (){	QUEUE *q;	q = malloc (sizeof (QUEUE));	return (QUEUE *) q;}static inline voidqueue_push (QUEUE *q, void *data) {	List *n;	n = malloc (sizeof (List));	n->data = data;	n->next = NULL;		if (q->tail == NULL) {		q->head = n;	} else {		q->tail->next = n;		}		q->tail = n;}static inline void *queue_pop (QUEUE *q){	List *l;	void *ret;		if (q->head == NULL) {		return NULL;	}		l = q->head;	q->head = q->head->next;		if (q->head == NULL) {		q->tail = NULL;	}		ret = l->data;	free (l);	return ret;}int main (int argc, char **argv){	QUEUE *q;	char *s;		q = queue_new ();	queue_push (q, "sir");	queue_push (q, "gicmo");	queue_push (q, "miguel");	while ((s = queue_pop (q)) != NULL) {		printf ("%s\n", s);	}	printf ("-------\n");	queue_push (q, "apfel");	queue_push (q, "birne");	printf ("%s\n", (char *) queue_pop (q));		queue_push (q, "bannae");	printf ("-------\n");	while ((s = queue_pop (q)) != NULL) {		printf ("%s\n", s);	}		return 0;}