ListNode *getNodeFromKey(ListNode *, char *);
int getNumNodes(ListNode *);
ListNode *getNodeFromKey(ListNode *, char *);
int getNumNodes(ListNode *);
boolean FileIsGraphic(char *);
boolean FileIsSound(char *);
boolean FileIsMusic(char *);
boolean FileIsGraphic(char *);
boolean FileIsSound(char *);
boolean FileIsMusic(char *);