initgraph, whole lot of refactor

include/string.h

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: ISC
+#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);