Starting Cryptopals challenge 1

set1/chal1/.gitignore

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+target/
+Cargo.lock

set1/chal1/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "chal1"
+version = "0.1.0"
+

set1/chal1/Cargo.toml

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+[package]
+name = "chal1"
+version = "0.1.0"
+authors = ["beneth <bmauduit@beneth.fr>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

set1/chal1/src/main.rs

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+use std::env;
+
+fn hex_to_char(s: &str) -> Result<char, std::num::ParseIntError> {
+    u8::from_str_radix(s, 16).map(|n| n as char)
+}
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    let input = &args[1];
+
+    let char_vec: Vec<char> = input.chars().collect();
+    let split = &char_vec.chunks(2)
+        .map(|chunk| chunk.iter().collect::<String>())
+        .collect::<Vec<_>>();
+
+    for s in split {
+        println!("{:?}", hex_to_char(s));
+    }
+}