feat: day01 for rust

exercise/rust/day01/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "day01"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+chrono = "0.4.38"
+uuid = { version = "1.9.1", features = ["v4", "fast-rng", "macro-diagnostics"] }
+once_cell = "1.19.0"

exercise/rust/day01/src/food.rs

@@ -0,0 +1,15 @@
+use chrono::{DateTime, Utc};
+
+pub struct Food {
+    pub expiration_date: DateTime<Utc>,
+    pub approved_for_consumption: bool,
+    pub inspector_id: Option<uuid::Uuid>,
+}
+
+impl Food {
+    pub fn is_edible(&self, now: &DateTime<Utc>) -> bool {
+        self.expiration_date > *now &&
+            self.approved_for_consumption &&
+            self.inspector_id.is_some()
+    }
+}