Re-translate the Japanese version (#1871)

* Retranslate Japanese docs with GPT-5.4

* Retranslate Japanese code with GPT-5.4

ja/codes/c/chapter_hashing/simple_hash.c

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+/**
+ * File: simple_hash.c
+ * Created Time: 2023-09-09
+ * Author: Gonglja (glj0@outlook.com)
+ */
+
+#include "../utils/common.h"
+
+/* 加算ハッシュ */
+int addHash(char *key) {
+    long long hash = 0;
+    const int MODULUS = 1000000007;
+    for (int i = 0; i < strlen(key); i++) {
+        hash = (hash + (unsigned char)key[i]) % MODULUS;
+    }
+    return (int)hash;
+}
+
+/* 乗算ハッシュ */
+int mulHash(char *key) {
+    long long hash = 0;
+    const int MODULUS = 1000000007;
+    for (int i = 0; i < strlen(key); i++) {
+        hash = (31 * hash + (unsigned char)key[i]) % MODULUS;
+    }
+    return (int)hash;
+}
+
+/* XOR ハッシュ */
+int xorHash(char *key) {
+    int hash = 0;
+    const int MODULUS = 1000000007;
+
+    for (int i = 0; i < strlen(key); i++) {
+        hash ^= (unsigned char)key[i];
+    }
+    return hash & MODULUS;
+}
+
+/* 回転ハッシュ */
+int rotHash(char *key) {
+    long long hash = 0;
+    const int MODULUS = 1000000007;
+    for (int i = 0; i < strlen(key); i++) {
+        hash = ((hash << 4) ^ (hash >> 28) ^ (unsigned char)key[i]) % MODULUS;
+    }
+
+    return (int)hash;
+}
+
+/* Driver Code */
+int main() {
+    char *key = "Hello アルゴリズム";
+
+    int hash = addHash(key);
+    printf("加算ハッシュ値は %d\n", hash);
+
+    hash = mulHash(key);
+    printf("乗算ハッシュ値は %d\n", hash);
+
+    hash = xorHash(key);
+    printf("XORハッシュ値は %d\n", hash);
+
+    hash = rotHash(key);
+    printf("回転ハッシュ値は %d\n", hash);
+
+    return 0;
+}