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