Arranging the .txt file

Hi,

I have this saved .txt file in my app where it will record down the datas when I click save. However, the .txt file shows it in an arrangement like this:

0
1
2
3

I would like it to be like this:
0 1 2 3

It would be better if I can add in coma in between as well. How do I arrange it that way?

from B4X Community - Android, iOS, desktop, server and IoT programming tools http://ift.tt/299OAqG
via IFTTT