solve Challenge 1 of Set 1

.gitignore

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+*/*/target

set1/hex2base64/Cargo.lock

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+[root]
+name = "hex2base64"
+version = "0.1.0"
+dependencies = [
+ "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rustc-serialize"
+version = "0.3.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+

set1/hex2base64/Cargo.toml

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+[package]
+name = "hex2base64"
+version = "0.1.0"
+authors = ["Thomas Lindner <thomas.lindner@fau.de>"]
+
+[dependencies]
+rustc-serialize = "0.3"
+
+[[bin]]
+name = "hex2base64"
+path = "src/bin.rs"

set1/hex2base64/src/bin.rs

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+extern crate rustc_serialize;
+
+use rustc_serialize::hex::FromHex;
+use rustc_serialize::base64::{STANDARD, ToBase64};
+use std::io::{BufRead, stdin};
+
+fn main() {
+    let stdin = stdin();
+    for line in stdin.lock().lines().filter_map(|x| x.ok()) {
+        match line.from_hex() {
+            Ok(v) => println!("{}", v.to_base64(STANDARD)),
+            Err(e) => println!("{}", e)
+        }
+    }
+}