2.11 whitespace 去掉空格

package main

import (
	"fmt"
	"math"
	"regexp"
	"strconv"
	"strings"
)

func main() {

	stringToTrim := "		
   Go 	is	 Awesome 		"
	trimResult := strings.TrimSpace(stringToTrim)
	fmt.Println(trimResult)

	stringWithSpaces := "		
   Go 	is
 Awesome 		"
	r := regexp.MustCompile("\s+")
	replace := r.ReplaceAllString(stringWithSpaces, " ")
	fmt.Println(replace)

	needSpace := "need space"
	fmt.Println(pad(needSpace, 14, "CENTER"))
	fmt.Println(pad(needSpace, 14, "LEFT"))
}

func pad(input string, padLen int, align string) string {
	inputLen := len(input)

	if inputLen >= padLen {
		return input
	}

	repeat := padLen - inputLen
	var output string
	switch align {
	case "RIGHT":
		output = fmt.Sprintf("% "+strconv.Itoa(-padLen)+"s", input)
	case "LEFT":
		output = fmt.Sprintf("% "+strconv.Itoa(padLen)+"s", input)
	case "CENTER":
		bothRepeat := float64(repeat) / float64(2)
		left := int(math.Floor(bothRepeat)) + inputLen
		right := int(math.Ceil(bothRepeat))
		output = fmt.Sprintf("% "+strconv.Itoa(left)+"s% "+strconv.Itoa(right)+"s", input, "")
	}
	return output
}

/*
Go 	is	 Awesome
 Go is Awesome
  need space
    need space

*/