(Kindle) any format.Add space @ end line

source epub or pdf
convert to azw3 , mobi or pdf .
Every format add a enter space at the end of the line . Example:

Original
asbhhabf fsdfsdf fsdfdf fdfdfg
sdfkdjsfhs dfskfkdlf.
asbhhabf fsdfsdf fsdfdf fdfdfg

Converted
asbhhabf fsdfsdf fsdfdf fdfdfg

sdfkdjsfhs dfskfkdlf.

asbhhabf fsdfsdf fsdfdf fdfdfg

Any help ?

Edit : When I edit HTML I found<br> at the end of each line. this is the space , but when I replace with nothing it looks like this :

asbhhabf fsdfsdf fsdfdf fdfdfgsdfkdjsfhs dfskfkdlf.asbhhabf fsdfsdf fsdfdf fdfdfg

The idea is :

asbhhabf fsdfsdf fsdfdf fdfdfg
sdfkdjsfhs dfskfkdlf.
asbhhabf fsdfsdf fsdfdf fdfdfg