Application for removing blank rows

[valdet]

As title hints it, I would like some advice if there is an application that would remove blank rows from any type of text based file.

I've googled with many terms but couldnt find any.

Here is a rough example of how would it look:

Replace this block of text:

This is the first row

The second row is a bit longer



The third row is longer and more than two lines away
The fourth row is right here









The fifth row is awayyyy

with this:

This is the first row
The second row is a bit longer
The third row is longer and more than two lines away
The fourth row is just here
The fifth row is awayyyy

Thanks and best regards,
Val.