feat: improve extension parsing (#235)

* feat: improve extension parsing

* refactor: Refactor extension parsing and update file names.

- Refactor extension parsing function for clarity and DRYness
- Update name of a file to "Secure Preferences"
- Add TODO comment for future work on extension files and folders
- Remove unnecessary file write operation and import statement

---------

Co-authored-by: moonD4rk <moond4rk13@gmail.com>

utils/fileutil/filetutil.go

@@ -3,7 +3,6 @@ package fileutil
 import (
 	"archive/zip"
 	"bytes"
-	"errors"
 	"fmt"
 	"os"
 	"path"
@@ -37,21 +36,6 @@ func IsDirExists(folder string) bool {
 	return info.IsDir()
 }
 
-// FilesInFolder returns the filepath contains in the provided folder
-func FilesInFolder(dir, filename string) ([]string, error) {
-	if !IsDirExists(dir) {
-		return nil, errors.New(dir + "folder does not exist")
-	}
-	var files []string
-	err := filepath.Walk(dir, func(path string, f os.FileInfo, err error) error {
-		if !f.IsDir() && strings.HasSuffix(path, filename) {
-			files = append(files, path)
-		}
-		return err
-	})
-	return files, err
-}
-
 // ReadFile reads the file from the provided path
 func ReadFile(filename string) (string, error) {
 	s, err := os.ReadFile(filename)
@@ -67,33 +51,6 @@ func CopyDir(src, dst, skip string) error {
 	return cp.Copy(src, dst, s)
 }
 
-// CopyDirHasSuffix copies the directory from the source to the destination
-// contain is the file if you want to copy, and rename copied filename with dir/index_filename
-func CopyDirHasSuffix(src, dst, suffix string) error {
-	var files []string
-	err := filepath.Walk(src, func(path string, f os.FileInfo, err error) error {
-		if !f.IsDir() && strings.HasSuffix(strings.ToLower(f.Name()), suffix) {
-			files = append(files, path)
-		}
-		return err
-	})
-	if err != nil {
-		return err
-	}
-	if err := os.MkdirAll(dst, 0o700); err != nil {
-		return err
-	}
-	for index, file := range files {
-		// p = dir/index_file
-		p := fmt.Sprintf("%s/%d_%s", dst, index, BaseDir(file))
-		err = CopyFile(file, p)
-		if err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
 // CopyFile copies the file from the source to the destination
 func CopyFile(src, dst string) error {
 	s, err := os.ReadFile(src)