Add kotlin code for the chapter of hashing (#1104)

* feat(kotlin): add kotlin code for dynamic programming.

* Update knapsack.kt

* feat(kotlin): add kotlin codes for graph.

* style(kotlin): reformatted the codes.

* feat(kotlin): add kotlin codes for the chapter of greedy.

* Update max_product_cutting.kt

* feat(kotlin): add kotlin code for chapter of hashing.

* style(kotlin): modified some comment

* Update array_hash_map.kt

* Update hash_map_chaining.kt

* Update hash_map_chaining.kt

codes/kotlin/chapter_hashing/simple_hash.kt

@@ -0,0 +1,62 @@
+/**
+ * File: simple_hash.kt
+ * Created Time: 2024-01-25
+ * Author: curtishd (1023632660@qq.com)
+ */
+
+package chapter_hashing
+
+const val MODULUS = 10_0000_0007
+
+/* 加法哈希 */
+fun addHash(key: String): Int {
+    var hash = 0L
+    for (c in key.toCharArray()) {
+        hash = (hash + c.code) % MODULUS
+    }
+    return hash.toInt()
+}
+
+/* 乘法哈希 */
+fun mulHash(key: String): Int {
+    var hash = 0L
+    for (c in key.toCharArray()) {
+        hash = (31 * hash + c.code) % MODULUS
+    }
+    return hash.toInt()
+}
+
+/* 异或哈希 */
+fun xorHash(key: String): Int {
+    var hash = 0
+    for (c in key.toCharArray()) {
+        hash = hash xor c.code
+    }
+    return hash and MODULUS
+}
+
+/* 旋转哈希 */
+fun rotHash(key: String): Int {
+    var hash = 0L
+    for (c in key.toCharArray()) {
+        hash = ((hash shl 4) xor (hash shr 28) xor c.code.toLong()) % MODULUS
+    }
+    return hash.toInt()
+}
+
+/* Driver Code */
+fun main() {
+    val key = "Hello 算法"
+
+    var hash: Int = addHash(key)
+    println("加法哈希值为 $hash")
+
+    hash = mulHash(key)
+    println("乘法哈希值为 $hash")
+
+    hash = xorHash(key)
+    println("异或哈希值为 $hash")
+
+    hash = rotHash(key)
+    println("旋转哈希值为 $hash")
+}