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Kivanc Gunalp 316311e08c Add file I/O exercises (file_io1-3) 
Adds three new exercises under exercises/24_file_io/, as proposed in rust-lang/rustlings#2233:

- file_io1: read a whole file with fs::read_to_string and handle the Result.
- file_io2: read/write a file efficiently with BufReader/BufWriter.
- file_io3: build a path with PathBuf and inspect it with .metadata().

Includes matching solutions and a README describing the learning goal of
each exercise.
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dev
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exercises
Add file I/O exercises (file_io1-3)
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rustlings-macros
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solutions
Add file I/O exercises (file_io1-3)
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src
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tests
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website
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.gitignore
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.rumdl.toml
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.typos.toml
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build.rs
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Cargo.toml
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clippy.toml
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CONTRIBUTING.md
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dev-Cargo.toml
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LICENSE
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README.md
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README.md

Rustlings 🦀

Small exercises to get you used to reading and writing Rust code - Recommended in parallel to reading the official Rust book 📚️

Visit the website for a demo, info about setup and more:

➡️ rustlings.rust-lang.org ⬅️

Description
🦀 Small exercises to get you used to reading and writing Rust code!
beginner-friendlyrustrustlings
Readme MIT 39 MiB
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