use freestanding headers

include/string.h

@@ -1,14 +0,0 @@
-#pragma once
-
-#include <stddef.h>
-
-size_t strlen(const char* str);
-size_t strnlen(const char* str, size_t len);
-int memcmp(const void* s1, const void* s2, size_t size);
-void* memcpy(void* restrict dest, const void* restrict src, size_t n);
-void* memmove(void* dstptr, const void* srcptr, size_t size);
-void* memset(void* dest, int value, size_t n);
-char* strncpy(char* restrict dst, const char* restrict src, size_t len);
-int strcmp(const char* str1, const char* str2);
-int strncmp(const char* str1, const char* str2, size_t len);
-char* strchr(const char* c, int s);