Candlestick Example about charming HOT 4 CLOSED

// pass df into this function, assuming column names below or edit them to match properly
fn parse_ohlc_data(data: DataFrame) -> Result< (Vec<Vec<f64>>, Vec<String> ), Box<dyn std::error::Error> > {
       let d_open: Vec<f64> = data.column("open")?.f64()?.into_iter().map(|x| x.unwrap()).collect();
       let d_high: Vec<f64> = data.column("high")?.f64()?.into_iter().map(|x| x.unwrap()).collect();
       let d_low: Vec<f64> = data.column("low")?.f64()?.into_iter().map(|x| x.unwrap()).collect();
       let d_close: Vec<f64> = data.column("close")?.f64()?.into_iter().map(|x| x.unwrap()).collect();
       let dt: Vec<String> = data.column("date")?.iter().map(|x| x.to_string()).collect(); 
       let mut ohlc_vec: Vec<Vec<f64>> = Vec::new();
       for i in 0..d_open.len() {
            let array: [f64;4] = [d_open[i], d_high[i], d_low[i], d_close[i]]; 
            ohlc_vec.push(array.to_vec());
        }
        Ok((ohlc_vec, dt)) 
}
pub fn build_symbol_chart(symbol_name: &str, ohlc: (Vec<Vec<f64>>, Vec<String>)) -> Result<(), EchartsError> {
    let chart = Chart::new()
        .x_axis(Axis::new().show(true).data(ohlc.1))
        .y_axis(Axis::new().show(true).scale(true))
        .data_zoom(
            DataZoom::new()
                .type_(DataZoomType::Slider)
                .min_value_span(5),
        )
        .series(Candlestick::new().data(
            ohlc.0
        )).background_color("6E7468");

    let mut rend = HtmlRenderer::new("OHLCV", 1000, 800).theme(Westeros);
    let dir_file = format!("./html/charts/{}.html", symbol_name);
    HtmlRenderer::render(&rend, &chart)?;
    rend.save(&chart, std::path::Path::new(&dir_file))?;
    // println!("saving chart to html");
    
    Ok(())
}
// EXAMPLE
//converts polars df to work with charming
let ohlc = parse_ohlc_data(data).unwrap();

// creates an html file for candlestick charts
tools::chart::build_symbol_chart(YOUR_FILE_NAME_HERE, ohlc)?;