Forge C into
Safe Rust

typedef struct cJSON {
  struct cJSON *next, *prev;
  struct cJSON *child;
  int type;
  char *valuestring;
  double valuedouble;
} cJSON;

cJSON *cJSON_Parse(const char *value) {
  cJSON *c = malloc(sizeof(cJSON));
  if (!c) return NULL;
  memset(c, 0, sizeof(cJSON));
  // ... parse, malloc children,
  // manual linked list management
  return c;
}

enum JsonValue {
    Null,
    Bool(bool),
    Number(f64),
    Str(String),
    Array(Vec<JsonValue>),
    Object(Vec<(String, JsonValue)>),
}

fn parse(input: &str) -> Option<JsonValue> {
    let trimmed = input.trim();
    let (value, _) = parse_value(trimmed)?;
    // No malloc, no free, no linked lists
    // RAII + enum + Vec = safe by default
    Some(value)
}