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char *strerror(int errnum); void *memset(void *s, int c, size_t n); size_t strlen(const char *s);
char *strcpy(char *dest, const char *src); char *strncpy(char *dest, const char *src, size_t n); void *memcpy(void *dest, const void *src, size_t n); void *memmove(void *dest, const void *src, size_t n);
char *strcat(char *dest, const char *src); char *strncat(char *dest, const char *src, size_t n);
int memcmp(const void *s1, const void *s2, size_t n); int strcmp(const char *s1, const char *s2); int strncmp(const char *s1, const char *s2, size_t n);
char *strchr(const char *s, int c); char *strrchr(const char *s, int c); char *strstr(const char *haystack, const char *needle);
char *strtok(char *str, const char *delim); char *strtok_r(char *str, const char *delim, char **saveptr);
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