fetchCandles function
fetch candles using binance api
Implementation
Future<List<Candle>> fetchCandles(
{required String symbol, required String interval}) async {
final uri = Uri.parse(
"https://api.binance.com/api/v3/klines?symbol=$symbol&interval=$interval&limit=1000");
final res = await http.get(uri);
List<dynamic> data = jsonDecode(res.body);
/// return candles
return (data).map((e) => Candle.fromJson(e)).toList();
}