Golang Rename unicode file name -

how rename file in unicode format, gaps? when try rename standard library function, file not located.

old: /usr/home/spouk/go/src/simple/agraba - know smiling (original mix).mp4 new: /usr/home/spouk/go/src/simple/agraba_-_i_know_you_are_smiling_now__original_mix_.mp4 [rename] rename agraba - know smiling (original mix).mp4 /usr/home/spouk/go/src/simple/agraba_-_i_know_you_are_smiling_now__original_mix_.mp4: no such file or directory 

someone tell me use or acquainted direction of solution problem. tnx.

package main  import (     "flag"     d "github.com/fiam/gounidecode/unidecode"     "fmt"     "path/filepath"     "os"     "strings"     "strconv"     "os/exec" )  type (     file struct {         originpath  string         convertpath string     }     filesstack struct {         files   []file         inpath  string         outpath string     } )  func newfilesstack() *filesstack {     n := new(filesstack)     n.files = []file{}     return n } func (f *filesstack) runetoascii(r rune) string {     if r < 128 {         return string(r)     } else {         return "\\u" + strconv.formatint(int64(r), 16)     } } func (f *filesstack) translitercyr(str string) string {     var result []string     _, sym := range d.unidecode(str) {         if (f.runetoascii(sym) == " ") || (f.runetoascii(sym) == "'") || (f.runetoascii(sym) == "`") || (f.runetoascii(sym) == ")") || (f.runetoascii(sym) == "(") {             result = append(result, "_")         } else {             result = append(result, f.runetoascii(sym))         }     }     return strings.join(result, "") } func (f *filesstack) walkfunction(path string, info os.fileinfo, err error) error {      if !info.isdir() {         res, err := filepath.abs(filepath.dir(info.name()))         if err != nil {             fmt.printf(err.error())         }         ext := filepath.ext(info.name())         if ext == ".mp4" {             file := new(file)             //make new file name             oldfile := filepath.join(res, info.name())             newname := filepath.join(res, f.translitercyr(info.name()))              file.originpath = filepath.join(res, newname)             fmt.printf("old: %s\nnew: %s\n", oldfile, newname)              //rename file             if err_rename := os.rename(info.name(), newname); err_rename != nil {                 fmt.printf("[rename] %s\n", err_rename.error())             }              tmpname := []string{}             name := strings.trimright(info.name(), filepath.ext(info.name()))             _, sym := range name {                 if f.runetoascii(sym) != " " {                     tmpname = append(tmpname, string(sym))                 }             }             word := strings.join(tmpname, "")             oo, _ := filepath.abs(f.outpath)             rr := strings.join([]string{f.translitercyr(word), ".mp3"}, "")             //fmt.printf("res: %v %v\n", rr, word)             file.convertpath = filepath.join(oo, rr)             //fmt.printf("infile: %v\n", file.originpath)             //fmt.printf("outfile: %v\n", file.convertpath)             f.files = append(f.files, *file)         }     }     return nil } func (f *filesstack) parsefilesmp4() {     //парсинг файлов     if err := filepath.walk(f.inpath, f.walkfunction); err != nil {         fmt.printf(err.error())     }     //конвертация      _, file := range f.files {         fmt.printf("start convertation %s \n", file.originpath)         command := fmt.sprintf("ffmpeg -i %s -f mp3 %s", file.originpath, file.convertpath)         //fmt.printf("command %v\n", command)         cmd, err_convert := exec.command(command).output()         if err_convert != nil {             fmt.printf(err_convert.error())         }          fmt.printf("result convert: %v\n", cmd)     } }  // note, variables pointers var (     inpath = flag.string("inpath", ".", "директория для поиска всех файлов с расширением .mp4")     outpath = flag.string("outpath", ".", "директория для сохранения .mp3") )  func main() {     //make files structy     f := newfilesstack()     //parse arguments     flag.parse()     fmt.printf("inpath: %s\noutpath: %s\n", *inpath, *outpath)     //set arguments     f.inpath = *inpath     f.outpath = *outpath     f.parsefilesmp4() }