From 282e55122e32270f3fd2ec85efa979f669fdaac9 Mon Sep 17 00:00:00 2001
From: toyboot4e <toyboot4e@gmail.com>
Date: Fri, 8 May 2020 19:56:41 +0900
Subject: [PATCH] Update src/config.rs

Co-authored-by: Eric Huss <eric@huss.org>
---
 src/config.rs | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/src/config.rs b/src/config.rs
index 91f49681..d56614d7 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -145,14 +145,9 @@ impl Config {
             if key == "book" || key == "build" {
                 if let serde_json::Value::Object(ref map) = parsed_value {
                     // To `set` each `key`, we wrap them as `prefix.key`
-                    let prefix = &key; // "book" or "build"
-                    let mut s = String::new();
                     for (k, v) in map {
-                        s.clear();
-                        s.push_str(prefix);
-                        s.push('.');
-                        s.push_str(k);
-                        self.set(&s, v).expect("unreachable");
+                        let full_key = format!("{}.{}", key, k);
+                        self.set(&full_key, v).expect("unreachable");
                     }
                     return;
                 }