Sift duplicate whitespaces away in just one function call.
This crate helps you remove duplicate whitespaces within the &str.
Other than that, it naturally removes the whitespaces at the start and end of the &str.
```rust use whitespace_sifter::*;
// This prints 1.. 2.. 3.. 4.. 5...
println!("{}", sift(
"1.. \n2.. \n\n3.. \n\n\n4.. \n\n\n\n5.. \n\n\n\n\n"
));
// This prints A..\r\nB..\r\nC..\r\nD..\r\nE...
println!("{}", siftwithcarriage_return(
"A..\r\n B..\r\n\r\n C..\r\n\r\n\r\n D..\r\n\r\n\r\n\r\n E..\r\n\r\n\r\n\r\n\r\n"
));
// This prints 1..\n2..\n3..\n4..\n5...
println!("{}", preserve_newline::sift(
"1.. \n2.. \n\n3.. \n\n\n4.. \n\n\n\n5.. \n\n\n\n\n"
));
// This prints A..\r\nB..\r\nC..\r\nD..\r\nE...
println!("{}", preservenewline::siftwithcarriagereturn(
"A.. \r\n B.. \r\n\r\n C.. \r\n\r\n\r\n D.. \r\n\r\n\r\n\r\n E.. \r\n\r\n\r\n\r\n\r\n"
));
```