modified to use library functions (memcpy(), bzero())
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@@ -18,6 +18,7 @@ extern char *strcat(char *dst, const char *src);
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extern char *strncat(char *dst, const char *src, int max);
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extern int atoi(const char *c);
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extern void *memcpy(void *dst, const void *src, size_t n);
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extern void bzero(void *s, size_t n);
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#define isdigit(c) (((c) >= '0') && ((c) <= '9'))
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#define isupper(c) ((c) >= 'A' && ((c) <= 'Z'))
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