Feat: lab 3 w/o adv 2

include/string.h

@@ -5,6 +5,7 @@
 int strcmp(const char *lhs, const char *rhs);
 char *strcpy(char *destination, const char *source);
 size_t strlen(const char *str);
+char *strtok_r(char *str, const char *delimiters, char **saveptr);
 
 void *memcpy(void *dest, const void *src, size_t count);
 void *memzero(void *start, void *end);