XmlToMap 这个方法有bug，当xml 前面有空格的时候，返回的map为空

[xyy11070]

str := `<xml>
 <trade_type><![CDATA[APP]]></trade_type>
 <prepay_id><![CDATA[wx20190506151427404120]]></prepay_id>
 <nonce_str><![CDATA[1557126867008139000]]></nonce_str>
 <return_code><![CDATA[SUCCESS]]></return_code>
 <err_code_des><![CDATA[ok]]></err_code_des>
 <sign><![CDATA[3C323ECE220CC631240E874F80C3737D]]></sign>
 <mch_id><![CDATA[1225268501]]></mch_id>
 <return_msg><![CDATA[OK]]></return_msg>
 <appid><![CDATA[wxe353414396c4b931]]></appid>
 <device_info><![CDATA[sandbox]]></device_info>
 <result_code><![CDATA[SUCCESS]]></result_code>
 <err_code><![CDATA[SUCCESS]]></err_code>
 </xml>`
	mp := wxpay.XmlToMap(str)

[cs50Mu]

I fixed this bug, for anyone who are bothered by this problem, here is the code, it's actually very simple:

func XmlToMap(xmlStr string) Params {

	params := make(Params)
	decoder := xml.NewDecoder(strings.NewReader(xmlStr))

	var (
		key string
		value string
	)

 inBetween := false
 for t, err := decoder.Token(); err == nil; t, err = decoder.Token() {
 switch token := t.(type) {
 case xml.StartElement:
 key = token.Name.Local
 if key == "xml" {
 continue
 }
 inBetween = true
 case xml.CharData:
 if !inBetween {
 continue
 }
 value = string([]byte(token))
 params[key] = value
 case xml.EndElement:
 inBetween = false
 }

 }

	return params
}