+** utils.h -- utility prototypes
+*/
+
+void *mh_xrealloc(void *, size_t);
+void *mh_xcalloc(size_t, size_t);
+void mh_free0(void *);
+char *pwd(void);
+char *add(const char *, char *);
+void create_folder(char *, int, void (*)(int));
+int num_digits(int);
+char *mh_xstrdup(char *);