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Friday, on Globo Reporter.

Change &str to enum

http://deterministic.space/elegant-apis-in-rust.html#what-makes-an-api-elegant
https://doc.rust-lang.org/stable/book/second-edition/ch06-01-defining-an-enum.html

Coming from dynamically typed languages, you might be tempted to use strings with specific 
values in various places.

For example: You want a function to print some input text in a color, so you use a parameter
 color of type &str. That also means you expect your users to write one of the names from a
limited number of color names (like ["red", "green", "blue", "light golden rod yellow"]).

This is not what you should do in Rust! If you know all possible variants beforehand, use an enum. 
This way, you don’t need to parse/pattern match the string – and deal with possible errors – but can 
be sure that a user of your API can only ever supply valid inputs.```

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