Remove base58 library usage

Author: ingon

go.mod

@@ -4,7 +4,6 @@ go 1.24.0
 
 require (
 	github.com/gofrs/flock v0.13.0
-	github.com/mr-tron/base58 v1.2.0
 	github.com/plar/go-adaptive-radix-tree/v2 v2.0.4
 	github.com/stretchr/testify v1.11.1
 	golang.org/x/exp v0.0.0-20251125195548-87e1e737ad39

go.sum

@@ -7,8 +7,6 @@ github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
 github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
-github.com/mr-tron/base58 v1.2.0 h1:T/HDJBh4ZCPbU39/+c3rRvE0uKBQlU27+QI8LJ4t64o=
-github.com/mr-tron/base58 v1.2.0/go.mod h1:BinMc/sQntlIE1frQmRFPUoPA1Zkr8VRgBdjWI2mNwc=
 github.com/plar/go-adaptive-radix-tree/v2 v2.0.4 h1:Viv/uI+PUSY+nXF6uNUYeVjw/6grZG+ngVGGFixjX+U=
 github.com/plar/go-adaptive-radix-tree/v2 v2.0.4/go.mod h1:8yf9K81YK94H4gKh/K3hCBeC2s4JA/PYgqMkkOadwvk=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=

segment/segment.go

@@ -269,7 +269,7 @@ func (s Segment) Backup(targetDir string) error {
 }
 
 func (s Segment) ForRewrite() (Segment, error) {
-	randStr, err := randStr(8)
+	randStr, err := randStr(5)
 	if err != nil {
 		return Segment{}, err
 	}

segment/utils.go

@@ -2,19 +2,20 @@ package segment
 
 import (
 	"crypto/rand"
+	"encoding/base32"
 	"fmt"
 	"io"
 	"os"
-
-	"github.com/mr-tron/base58"
 )
 
+var randEncode = base32.NewEncoding("0123456789abcdefghijklmnopqrstuv").WithPadding(base32.NoPadding)
+
 func randStr(length int) (string, error) {
 	k := make([]byte, length)
 	if _, err := io.ReadFull(rand.Reader, k); err != nil {
 		return "", fmt.Errorf("rand read: %w", err)
 	}
-	return base58.Encode(k), nil
+	return randEncode.EncodeToString(k), nil
 }
 
 func copyFile(src, dst string) error {