code refactor

* new json route added
* new remoteAddr func added

main.go

 import (
   "log"
   "net/http"
+  "strings"
   "encoding/json"
 )
 
-type output struct{}
+type jsonOutput struct {
+	Ip string `json:"ip"`
+}
 
-func (o output) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	jsonOutput, err :=  json.MarshalIndent (r.RemoteAddr, "", " ")
+func ipJsonOutput (w http.ResponseWriter, r *http.Request) {
+	var ip jsonOutput
+	ip.Ip = remoteAddr(r)
+	output, err := json.Marshal(ip)
 	if err != nil {
 		w.Write([]byte(err.Error()))
 	}
-	w.Write(jsonOutput)
+	w.Write([]byte(output))
+}
+
+func ipOutput (w http.ResponseWriter, r *http.Request) {
+	ip := remoteAddr(r)
+	w.Write([]byte(ip))
+}
+
+func remoteAddr ( r *http.Request) string {
+	var ip string
+	if r.RemoteAddr[0] == '[' {
+		ip = strings.Split(r.RemoteAddr,"]")[0][1:]
+	} else {
+		ip = strings.Split(r.RemoteAddr,":")[0]
+	}
+	return ip
 }
 
 func main() {
-	log.Fatal(http.ListenAndServe(":8080", output{}))
+	http.HandleFunc("/",ipOutput)
+	http.HandleFunc("/json",ipJsonOutput)
+	log.Fatal(http.ListenAndServe(":8080", nil))
 }