Makes sure folders are created when files are added

Added some comments

writer_write.go

@@ -3,34 +3,14 @@ package squashfs
 import (
 	"errors"
 	"io"
-	"io/fs"
 	"math"
 	"time"
 )
 
-func (w *Writer) fixFolders() error {
-	for folder := range w.structure {
-		if folder == "/" || w.Contains(folder) {
-			continue
-		}
-		err := w.AddFolderTo(folder, fs.ModePerm)
-		if err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
 //WriteTo attempts to write the archive to the given io.Writer.
-//Folder that aren't present (such as if you add a file at /folder/file, but not the folder /folder)
-//are added with full permission (777).
 //
 //Not working. Yet.
 func (w *Writer) WriteTo(write io.Writer) (int64, error) {
-	err := w.fixFolders()
-	if err != nil {
-		return 0, err
-	}
 	if w.BlockSize > 1048576 {
 		w.BlockSize = 1048576
 	} else if w.BlockSize < 4096 {