How to do it...

1. Open the console and create the folder chapter02/recipe12.
2. Create the file main.go with the following content:

         package main

         import (
           "fmt"
           "strconv"
           "strings"
           "unicode"
         )

         func main() {

           text := "Hi! Go is awesome."
           text = Indent(text, 6)
           fmt.Println(text)

           text = Unindent(text, 3)
           fmt.Println(text)

           text = Unindent(text, 10)
           fmt.Println(text)

           text = IndentByRune(text, 10, '.')
           fmt.Println(text)

         }

         // Indent indenting the input by given indent and rune
         func IndentByRune(input string, indent int, r rune) string {
           return strings.Repeat(string(r), indent) + input
         }

         // Indent indenting the input by given indent
         func Indent(input string, indent int) string {
           padding := indent + len(input)
           return fmt.Sprintf("% "+strconv.Itoa(padding)+"s", input)
         }

         // Unindent unindenting the input string. In case the
         // input is indented by less than "indent" spaces
         // the min of this both is removed.
         func Unindent(input string, indent int) string {

           count := 0
           for _, val := range input {
             if unicode.IsSpace(val) {
               count++
             }
             if count == indent || !unicode.IsSpace(val) {
               break
             }
           }

           return input[count:]
         }

1. Run the code by executing go run main.go in the Terminal.
2. See the output: