#include <stddef.h>
// Strings
-extern int strlen(const char *string);
+extern size_t strlen(const char *string);
+extern size_t strnlen(const char *string, size_t maxlen);
extern int strcmp(const char *str1, const char *str2);
extern int strncmp(const char *str1, const char *str2, size_t len);
extern char *strcpy(char *dst, const char *src);