feat(Kotlin): Replace value with _val (#1254)

* ci(kotlin): Add workflow file.

* Update kotlin.yml

* style(kotlin): value -> _val

---------

Co-authored-by: Yudong Jin <krahets@163.com>

codes/kotlin/chapter_hashing/hash_map_chaining.kt

@@ -42,14 +42,14 @@ class HashMapChaining() {
         val bucket = buckets[index]
         // 遍历桶，若找到 key ，则返回对应 val
         for (pair in bucket) {
-            if (pair.key == key) return pair.value
+            if (pair.key == key) return pair._val
         }
         // 若未找到 key ，则返回 null
         return null
     }
 
     /* 添加操作 */
-    fun put(key: Int, value: String) {
+    fun put(key: Int, _val: String) {
         // 当负载因子超过阈值时，执行扩容
         if (loadFactor() > loadThres) {
             extend()
@@ -59,12 +59,12 @@ class HashMapChaining() {
         // 遍历桶，若遇到指定 key ，则更新对应 val 并返回
         for (pair in bucket) {
             if (pair.key == key) {
-                pair.value = value
+                pair._val = _val
                 return
             }
         }
         // 若无该 key ，则将键值对添加至尾部
-        val pair = Pair(key, value)
+        val pair = Pair(key, _val)
         bucket.add(pair)
         size++
     }
@@ -98,7 +98,7 @@ class HashMapChaining() {
         // 将键值对从原哈希表搬运至新哈希表
         for (bucket in bucketsTmp) {
             for (pair in bucket) {
-                put(pair.key, pair.value)
+                put(pair.key, pair._val)
             }
         }
     }
@@ -109,7 +109,7 @@ class HashMapChaining() {
             val res = mutableListOf<String>()
             for (pair in bucket) {
                 val k = pair.key
-                val v = pair.value
+                val v = pair._val
                 res.add("$k -> $v")
             }
             println(res)