algorithmz 1.2.9

This is the corresponding implemenation of the python module of the same name.
Documentation 
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use algorithmz::string::rotate;

#[test]
fn test_rotate_empty() {
    let result = rotate("",10);
    assert_eq!(result, Err("Cannot rotate an empty string!".to_string()));
}

#[test]
fn test_rotate() {
    let result = rotate("dani",2);
    assert_eq!(result, Ok(String::from("nida")));
}