c - My dequeue function doesn't work properly, what is my mistake? -

struct node* dequeue(struct queue *queue) { struct node *temp = queue->front; if (temp == null) {     printf("nothing delete");     return temp; } else if (temp->next == null) {     free(temp);     queue->front = null;     queue->rear = null;     printf("successfully delete.");     return temp; } else {     queue->rear = queue->rear->next;     free(temp);     printf("successfully delete.");     return temp; } } 

as printed in main() function data of deleted node, appears outputting random number, mistake here? please help.

you both free , return node. if want free node, don't return it. if want return node, don't free it. now, returning pointer node before freed it. use that?