Save function doesn't work correctly

[amiremohamadi]

Describe the bug
When you modify the word document and save it, the old document.xml must be replaced.
But currently It adds a file with the same name to the word document.

Example
In this case, after calling save function we have two document.xml:
Archive: my_test.docx
Length Date Time Name

---

  573  02-03-2019 17:16   _rels/.rels
  513  02-03-2019 17:16   docProps/app.xml
  732  02-03-2019 17:16   docProps/core.xml
  531  02-03-2019 17:16   word/_rels/document.xml.rels
  280  02-03-2019 17:16   word/settings.xml
  853  02-03-2019 17:16   word/fontTable.xml
 1480  02-03-2019 17:16   word/document.xml
 2585  02-03-2019 17:16   word/styles.xml
 1118  02-03-2019 17:16   [Content_Types].xml
 1602  07-03-2019 23:14   word/document.xml

---

10267                     10 files

Expected behavior
Remove the old document.xml and replace it with the new one.

Additional context
This may be due to the zip library.