algorithmz 1.1.8

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

#[test]
fn test_swap_characters_not_equal_length() {
    let result = swap_characters("dani","abc");
    assert_eq!(result,Err("Length must be equal!".to_string()));
}

#[test]
fn test_swap_characters() {
    let result = swap_characters("abcd","bacd");
    assert_eq!(result, Ok(true));
}