refactor: code cleanup

core/utils/file.go

@@ -6,7 +6,6 @@ import (
 	"encoding/hex"
 	"fmt"
 	"github.com/apex/log"
-	"github.com/crawlab-team/crawlab/core/constants"
 	"github.com/crawlab-team/crawlab/core/entity"
 	"io"
 	"io/fs"
@@ -211,13 +210,6 @@ func _Compress(file *os.File, prefix string, zw *zip.Writer) error {
 	return nil
 }
 
-func TrimFileData(data []byte) (res []byte) {
-	if string(data) == constants.EmptyFileData {
-		return res
-	}
-	return data
-}
-
 func ZipDirectory(dir, zipfile string) error {
 	zipFile, err := os.Create(zipfile)
 	if err != nil {