From 77fd6a3a1bb47b5cd92b5170da4b734670750e0f Mon Sep 17 00:00:00 2001
From: Rock070 <a0938130702@gmail.com>
Date: Sun, 31 Dec 2023 03:45:53 +0800
Subject: [PATCH] Refactor total_cost function to handle parsing errors

---
 exercises/13_error_handling/errors2.rs | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/exercises/13_error_handling/errors2.rs b/exercises/13_error_handling/errors2.rs
index 631fe67f..5fede0df 100644
--- a/exercises/13_error_handling/errors2.rs
+++ b/exercises/13_error_handling/errors2.rs
@@ -19,8 +19,6 @@
 // Execute `rustlings hint errors2` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
-
 use std::num::ParseIntError;
 
 pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
@@ -28,7 +26,11 @@ pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
     let cost_per_item = 5;
     let qty = item_quantity.parse::<i32>();
 
-    Ok(qty * cost_per_item + processing_fee)
+    let qty = match qty {
+        Ok(number)=> Ok(number * cost_per_item + processing_fee),
+        Err(err) => Err(err)
+    };
+    qty
 }
 
 #[cfg(test)]