Let us say I have a long string
    String s1="This is my world. This has to be broken."
I am breaking the above string at a fixed interval of string length let's say when it's 10.
So the output I get after breaking is
    This is my
    world. Thi
    s has to b
    e broken.
Where as I want that the string should contain complete words and not broken words.
Just like this I want the output to be
    This is my
    world.
    This has 
    to be 
    broken.
How can I achieve the above output.