容器化的无污染DNS服务
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#pragma once
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
/**
* Free the exported c-style string.
*/
void free_rust_string(const char *ptr);
/**
* Format the input text into JSON format and return a c-style string, or return
* `NULL` if an error occurs.
*/
const char *to_json(const char *content);