Use singular for directory names

example/puzzle_game/src/main.rs

@@ -0,0 +1,21 @@
+use anyhow::{Context, Result};
+use log::info;
+use puzzles::Puzzle;
+use std::fs::File;
+
+fn get_puzzle(filename: &str) -> Result<Puzzle> {
+    let fh = File::open(filename)
+        .with_context(|| format!("couldn't open the puzzle file {}", filename))?;
+    let puzzle = Puzzle::from_file(fh).context("couldn't convert data into a puzzle")?;
+    Ok(puzzle)
+}
+
+fn main() -> Result<()> {
+    env_logger::init();
+    let puzzle = match get_puzzle("puzzle.dat").context("Couldn't get the first puzzle") {
+        Ok(p) => p,
+        Err(_) => Puzzle::new(),
+    };
+    info!("Playing puzzle: {}", puzzle.name);
+    Ok(())
+}