Re-translate the Japanese version (#1871)

* Retranslate Japanese docs with GPT-5.4

* Retranslate Japanese code with GPT-5.4

ja/codes/rust/chapter_hashing/simple_hash.rs

@@ -0,0 +1,70 @@
+/*
+ * File: simple_hash.rs
+ * Created Time: 2023-09-07
+ * Author: night-cruise (2586447362@qq.com)
+ */
+
+/* 加算ハッシュ */
+fn add_hash(key: &str) -> i32 {
+    let mut hash = 0_i64;
+    const MODULUS: i64 = 1000000007;
+
+    for c in key.chars() {
+        hash = (hash + c as i64) % MODULUS;
+    }
+
+    hash as i32
+}
+
+/* 乗算ハッシュ */
+fn mul_hash(key: &str) -> i32 {
+    let mut hash = 0_i64;
+    const MODULUS: i64 = 1000000007;
+
+    for c in key.chars() {
+        hash = (31 * hash + c as i64) % MODULUS;
+    }
+
+    hash as i32
+}
+
+/* XOR ハッシュ */
+fn xor_hash(key: &str) -> i32 {
+    let mut hash = 0_i64;
+    const MODULUS: i64 = 1000000007;
+
+    for c in key.chars() {
+        hash ^= c as i64;
+    }
+
+    (hash & MODULUS) as i32
+}
+
+/* 回転ハッシュ */
+fn rot_hash(key: &str) -> i32 {
+    let mut hash = 0_i64;
+    const MODULUS: i64 = 1000000007;
+
+    for c in key.chars() {
+        hash = ((hash << 4) ^ (hash >> 28) ^ c as i64) % MODULUS;
+    }
+
+    hash as i32
+}
+
+/* Driver Code */
+fn main() {
+    let key = "Hello アルゴリズム";
+
+    let hash = add_hash(key);
+    println!("加算ハッシュ値は {hash}");
+
+    let hash = mul_hash(key);
+    println!("乗算ハッシュ値は {hash}");
+
+    let hash = xor_hash(key);
+    println!("XORハッシュ値は {hash}");
+
+    let hash = rot_hash(key);
+    println!("回転ハッシュ値は {hash}");
+}