feat: add rust codes for simple_hash (#724)

codes/rust/Cargo.toml

@@ -89,6 +89,11 @@ path = "chapter_stack_and_queue/array_deque.rs"
 name = "linkedlist_deque"
 path = "chapter_stack_and_queue/linkedlist_deque.rs"
 
+# Run Command: cargo run --bin simple_hash
+[[bin]]
+name = "simple_hash"
+path = "chapter_hashing/simple_hash.rs"
+
 # Run Command: cargo run --bin hash_map
 [[bin]]
 name = "hash_map"

codes/rust/chapter_hashing/simple_hash.rs

@@ -0,0 +1,71 @@
+/*
+ * File: simple_hash.rs
+ * Created Time: 2023-09-07
+ * Author: night-cruise (2586447362@qq.com)
+ */
+
+
+/* 加法哈希 */
+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
+} 
+
+/* 乘法哈希 */
+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
+}
+
+/* 异或哈希 */
+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
+}
+
+/* 旋转哈希 */
+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 算法";
+
+    let hash = add_hash(key);
+    println!("加法哈希值为 {hash}");
+
+    let hash = mul_hash(key);
+    println!("乘法哈希值为 {hash}");
+
+    let hash = xor_hash(key);
+    println!("异或哈希值为 {hash}");
+
+    let hash = rot_hash(key);
+    println!("旋转哈希值为 {hash}");
+}