-extern void *emalloc(unsigned int size); /* allocates memory, exits on error */
-extern void eprint(const char *errstr, ...); /* prints errstr and exits with 1 */
-extern char *estrdup(const char *str); /* duplicates str, exits on allocation error */
+void *emalloc(unsigned int size); /* allocates memory, exits on error */
+void eprint(const char *errstr, ...); /* prints errstr and exits with 1 */
+char *estrdup(const char *str); /* duplicates str, exits on allocation error */