align columns

Implement http://rosettacode.org/wiki/Align_columns
ah sorry.. then I don't know... if on the playpen link I gave above I change line 4 to just `let (chunks, max_lengths) = align_columns(text);` it does not compile (mismatched types: expected `&str`, found `collections::string::String`)

Did you change the declaration of text on the previous line, maybe?