Golang : ROT47 (Caesar cipher by 47 characters) example

Here is an example of how to implement the ROT47 - Rotate 47 characters algorithm in Golang. ROT47 is a character substitution cipher that replaces a character within the ASCII range [33, 126] with the character 47. It is also an invertible algorithm where applying the algorithm twice will return the original text.

Here you go!

 package main

 import (
  "fmt"
  "strings"
 )

 func rot47(input string) string {

  var result []string
  for i := range input[:len(input)] {
 j := int(input[i])
 if (j >= 33) && (j <= 126) {
 result = append(result, string(rune(33+((j+14)%94))))
 } else {
 result = append(result, string(input[i]))
 }

  }
  return strings.Join(result, "")
 }

 func main() {

  text := "ROT47 makes text unreadable and it is also invertible algorithm!"
  fmt.Println("ROT47 : ")
  fmt.Println(text)
  fmt.Println(rot47(text))

  // invertible algorithm, apply the same algorithm twice to get the original text
  fmt.Println(rot47(rot47(text)))

 }

Output:

ROT47 :

ROT47 makes text unreadable and it is also invertible algorithm!

#~%cf >2<6D E6IE F?C62523=6 2?5 :E :D 2=D@ :?G6CE:3=6 2=8@C:E9>P

ROT47 makes text unreadable and it is also invertible algorithm!