big progress on JUtility

include/libc/string.h

@@ -13,6 +13,7 @@ void *memset(void *dest, int ch, size_t count);
 int memcmp(const void *ptr1, const void *ptr2, size_t num);
 
 size_t strlen(const char *s);
+long strtol(const char *str, char **end, int base);
 char *strcpy(char *dest, const char *src);
 char *strncpy(char *dest, const char *src, size_t num);
 int strcmp(const char *s1, const char *s2);