extern char *strcpy(char *dest, const char *src);
extern char *strncpy(char *dest, const char *src, size_t n);
extern int strcmp(const char *cs, const char *ct);
extern int strncmp(const char *cs, const char *ct, size_t count);
extern char *strcpy(char *dest, const char *src);
extern char *strncpy(char *dest, const char *src, size_t n);
extern int strcmp(const char *cs, const char *ct);
extern int strncmp(const char *cs, const char *ct, size_t count);