From 5077fbbdb470eea1a894ed660bfde0e2c3fd7159 Mon Sep 17 00:00:00 2001
From: "Teppei.F" <37261985+T3pp31@users.noreply.github.com>
Date: Fri, 17 Apr 2026 20:55:46 +0900
Subject: [PATCH] =?UTF-8?q?refactor:=20decrypt=5Fsafe=E3=81=A7decrypt?=
 =?UTF-8?q?=E3=82=92=E5=86=85=E9=83=A8=E5=88=A9=E7=94=A8=E3=81=99=E3=82=8B?=
 =?UTF-8?q?=E3=82=88=E3=81=86=E7=B5=B1=E4=B8=80?=
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---
 src/caesar_cipher.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/caesar_cipher.rs b/src/caesar_cipher.rs
index f5ada48..9a8d763 100644
--- a/src/caesar_cipher.rs
+++ b/src/caesar_cipher.rs
@@ -167,7 +167,8 @@ pub fn encrypt_safe(text: &str, shift: i16) -> Result<String, CipherError> {
 /// Decrypts text using Caesar cipher with error handling
 ///
 /// This function validates input values and returns an error for invalid inputs.
-/// Validates shift range before negation to prevent integer overflow.
+/// Internally uses `decrypt` after validation, so fixes in `decrypt`
+/// are automatically reflected in this safe API.
 ///
 /// # Arguments
 ///
@@ -203,7 +204,7 @@ pub fn decrypt_safe(text: &str, shift: i16) -> Result<String, CipherError> {
         )));
     }
 
-    Ok(shift_text(text, -shift))
+    Ok(decrypt(text, shift))
 }
 
 /// Internal implementation: Performs text-level Caesar cipher transformation