*/
void *mh_xmalloc(size_t);
void *mh_xrealloc(void *, size_t);
char *pwd(void);
char *add(char *, char *);
*/
void *mh_xmalloc(size_t);
void *mh_xrealloc(void *, size_t);
char *pwd(void);
char *add(char *, char *);
int folder_exists(char *);
void create_folder(char *, int, void (*)(int));
int num_digits(int);
int folder_exists(char *);
void create_folder(char *, int, void (*)(int));
int num_digits(int);