Feat: kernel thread done

include/string.h

@@ -8,4 +8,5 @@ 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 *memset(void *dest, int ch, size_t count);
 void *memzero(void *start, void *end);