go-reloaded

package main

import (
    "fmt"
    "io/ioutil"
    "os"
    "regexp"
    "strconv"
    "strings"
)

func main() {
    file, _ := ioutil.ReadFile("sample.txt")
    data := string(file)
    word := strings.Split(data, " ")

    for i := 0; i < len(word); i++ {
        switch word[i] {
        case "(cap)":
            word[i-1] = strings.Title(word[i-1])
        case "(up)":
            word[i-1] = strings.ToUpper(word[i-1])
        case "(low)":
            word[i-1] = strings.ToLower(word[i-1])
        case "(hex)":
            dec, _ := strconv.ParseInt(word[i-1], 16, 64)
            word[i-1] = strconv.Itoa(int(dec))
        case "(bin)":
            dec, _ := strconv.ParseInt(word[i-1], 2, 64)
            word[i-1] = strconv.Itoa(int(dec))
        case "(up,", "(low,", "(cap,":
            num, _ := strconv.ParseInt(word[i+1][:1], 0, 64)
            for j := int(num); j > 0; j-- {
                if word[i] == "(cap," {
                    word[i-j] = strings.Title(word[i-j])
                }
                if word[i] == "(up," {
                    word[i-j] = strings.ToUpper(word[i-j])
                }
                if word[i] == "(low," {
                    word[i-j] = strings.ToLower(word[i-j])
                }
            }
        case "a", "A":
            if word[i] == "a" || word[i] == "e" || word[i] == "i" || word[i] == "o" || word[i] == "u" || word[i] == "h" {
                word[i] = word[i] + "n"
            }
            if word[i] == "A" || word[i] == "E" || word[i] == "I" || word[i] == "O" || word[i] == "U" || word[i] == "H" {
                word[i] = word[i] + "n"
            }
        }
    }

    regex := regexp.MustCompile(`\(up\)|\(low\)|\(cap\)|\(hex\)|\(bin\)|\(up,|\(low,|\(cap,|\d+\)`)
    str := strings.Join(word, " ")
    del := regex.ReplaceAllString(str, " ")

    r := regexp.MustCompile(`  `)
    com := r.ReplaceAllString(del, "")

    com = strings.ReplaceAll(com, ".", " . ")
    com = strings.ReplaceAll(com, ",", " , ")
    com = strings.ReplaceAll(com, "!", " ! ")
    com = strings.ReplaceAll(com, "?", " ? ")
    com = strings.ReplaceAll(com, ":", " : ")
    com = strings.ReplaceAll(com, ";", " ; ")

    com = strings.Join(strings.Fields(com), " ")

    com = strings.ReplaceAll(com, " . ", ". ")
    com = strings.ReplaceAll(com, " ! ", "! ")
    com = strings.ReplaceAll(com, " ? ", "? ")
    com = strings.ReplaceAll(com, " : ", ": ")
    com = strings.ReplaceAll(com, " ; ", "; ")
    com = strings.ReplaceAll(com, " , ", ", ")

    com = strings.ReplaceAll(com, " .", ".")
    com = strings.ReplaceAll(com, " ,", ",")
    com = strings.ReplaceAll(com, " !", "!")
    com = strings.ReplaceAll(com, " ?", "?")
    com = strings.ReplaceAll(com, " :", ":")
    com = strings.ReplaceAll(com, " ;", ";")

    com = strings.Join(strings.Fields(com), " ")
    com = strings.ReplaceAll(com, "‘", "'")
    com = strings.ReplaceAll(com, "’", "'")
    counter := 0
    for i := 0; i < len(com)-1; i++ {
        if string(com[i]) == "'" && (string(com[i-1]) == " " || string(com[i+1]) == " ") {
            if counter%2 == 0 {
                if string(com[i+1]) == " " {
                    com = com[:i] + "‘" + com[i+2:] + " "
                }
                counter++
            } else {
                if string(com[i-1]) == " " {
                    com = com[:i-1] + "’" + com[i+1:] + " "
                }
                counter++
            }
        }
    }
    com = strings.ReplaceAll(com, "'", "‘")
    fmt.Println(com)
    os.WriteFile("result.txt", []byte(com), 0o0666)
}