move RandStr to helpers

package/package.go

@@ -3,7 +3,6 @@ package pkg
 import (
 	"fmt"
 	"bufio"
-	"math/rand"
 	"slices"
 	"strings"
 	"errors"
@@ -27,16 +26,8 @@ type Package struct {
     Data []interface{}
 }
 
-func randStr(n int) string {
-	b := make([]byte, n)
-	for i := range b {
-		b[i] = byte(rand.Intn(26) + 'a')
-	}
-	return string(b)
-}
-
 func randomTempDir(destDir string) string {
-	tempDir := "qulay_" + randStr(10)
+	tempDir := "qulay_" + helpers.RandStr(10)
 	tempDirPath := filepath.Join(destDir, tempDir)
 	os.MkdirAll(tempDirPath, 0755)
 	return tempDirPath