Step 3: Page 28

src/main.rs

@@ -1,4 +1,5 @@
 use clap::{Parser, Subcommand};
+use serde::{Deserialize, Serialize};
 
 #[derive(Parser)]
 #[command(name = "todo")]
@@ -16,6 +17,19 @@ enum Commands {
     Remove { id: usize },
 }
 
+#[derive(Serialize, Deserialize, Debug)]
+struct Task {
+    id: usize,
+    description: String,
+    completed: bool,
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+struct TodoList {
+    tasks: Vec<Task>,
+    next_id: usize,
+}
+
 fn main() {
     let cli = Cli::parse();
     match cli.command {