function cancellAll(){
    try{
        var openOrders = exchange.IO('api', 'GET', '/api/v3/openOrders');
        for (var i=0; i<openOrders.length; i++){
            var order = openOrders[i];
            var currency = '';
            if (order.symbol.endsWith('USDT')){
                currency = order.symbol.slice(0,order.symbol.length-4) + '_' + 'USDT';
            }
            else{
                currency = order.symbol.slice(0,order.symbol.length-3) + '_' + order.symbol.slice(order.symbol.length-3,order.symbol.length);