Function logcheck_demo_json 

#[unsafe(no_mangle)]
pub extern "C" fn logcheck_demo_json(
    _tag: *const c_char,
    _tag_len: usize,
    time_sec: u32,
    _time_nsec: u32,
    _record: *const c_char,
    _record_len: usize,
) -> *const c_char

Test/demo function that adds simple metadata