Convert freeform user input and write to a fixed length text file

I am trying to get free form user input using a text box and print it to text file. Objective is to write into a text file with fixed length, say length=25, While writing the text, if a word is getting cut in between (if it could not be accommodated within the record length), then the complete word should be written to next line. Note: I have already tried the options of .prn and have skimmed through the forum.

Example:
User Input in textbox : This is a sample file Please feel free to edit.
Expected Pattern in output text file:
This is a sample file
Please feel free to edit.


Code
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