adjust long char output format

I have a question,pls help me

<u>in the form :</u>

Description:&test&

<u>output result:</u>

Description:This is a long test charactersXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

<u>I want the result like this:</u>

Description:This is a long test characterscharactersf

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.

how to implement it???