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::repeat_string;

#[test]
fn test_repeat_string_negative() {
    let result = repeat_string("abc", "xyz");
    assert_eq!(result, -1);
}

#[test]
fn test_repeat_string() {
    let result = repeat_string("abc", "cabcabca");
    assert_eq!(result, 4);
}