Add 9 first days

9-encoding_error/.gitignore

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+/target

9-encoding_error/Cargo.toml

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+[package]
+name = "encoding_error"
+version = "0.1.0"
+authors = ["Guilhem MARION <gmarion@netc.fr>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

9-encoding_error/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}