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Add link to std in strings3 hint

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Seems like it's the first place, where `std` is introduced in Rustlings, and it's a good place to facilitate docs discovery for user. As _the book_ seems to have no Rustlings-sized solutions for this exercise.
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skaunov 2022-09-13 16:33:03 +03:00 committed by GitHub
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info.toml
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@ -449,7 +449,7 @@ path = "exercises/strings/strings3.rs"
mode = "test"
hint = """
There's tons of useful standard library functions for strings. Let's try and use some of
them!
them: <https://doc.rust-lang.org/std/string/struct.String.html#method.trim>!
For the compose_me method: You can either use the `format!` macro, or convert the string
slice into an owned string, which you can then freely extend."""