function toXml(obj) {
    var xml = {
        value:""
    };
    xml.value += "<?xml version=\"1.0\" encoding='UTF-8'?>"
    iterate(obj, xml);
    return xml.value;
}

function iterate(obj, xml){
    for (let key in obj) {
        let value = obj[key]
        xml.value += `<${key}>`
        if(Array.isArray(value)) {
            for (let i = 0; i < value.length; i++) {
                xml.value += "<item>"
                iterate(value[i], xml)
                xml.value += "</item>"
            }
        }else if(value instanceof Object) {
            iterate(value, xml)
        }else {
            xml.value += value
        }
        xml.value += `</${key}>`
    }
}