Modify the previous homework, so that your
program will replace continuous spaces with one space only, instead of
totally removing them.
The program may run as follows.
This is a book.
This is a book.
Please note that the input may contain "white spaces",
which consists of spaces (' ', ASCII code 32) and tabs ('\t', ASCII code 9).
Your program should replace a group of white spaces with a single space.
For example, the input
The man in the store said,
"We don't sell candy. Can't you read?"
should generate output like
The man in the store said,
"We don't sell candy. Can't you read?"