package main

import (
	"fmt"
	"sort"
	"io/ioutil"
  "encoding/json"
)

type Friend struct {
  Fname  string `json:"fname"`
	Sname string `json:"sname"`
	Gender  string `json:"gender"`
	Height int    `json:"height"`
}

func main() {

  content, err := ioutil.ReadFile("friends.json")
	if err != nil {
		fmt.Println(err.Error())
	}

  var friends []Friend

  err2 := json.Unmarshal(content, &friends)

  if err2 != nil {
    fmt.Println("Error JSON Unmarshalling")
    fmt.Println(err2.Error())
  }
	 firstnameSort(friends)
	heightOrderSort(friends)

}
func firstnameSort(friends []Friend){
	sort.Slice(friends, func(i, j int) bool { return friends[i].Fname < friends[j].Fname })
	for _,x := range friends{
		fmt.Printf("%s %s %d \n",x.Fname , x.Sname, x.Height)
		}
	}
func heightOrderSort(friends []Friend) {
	sort.Slice(friends, func(i, j int) bool {return friends[i].Height < friends[j].Height })
	fmt.Println("")
	for _,x := range friends{
    fmt.Printf("%s %s %d\n",x.Fname , x.Sname, x.Height)
  	}
	}