Added a bunch of new stuff no time to figure out what's what, No longer any compiler warnings

src/libc/include/string.h

@@ -1,8 +1,3 @@
+#pragma once
 #include <stddef.h>
-size_t strlen(const char* str){
-    size_t len = 0;
-    while(str[len]){
-        len++;
-    }
-    return len;
-}
+size_t strlen(const char* str);