diff --git a/src/Test344.kt b/src/Test344.kt
new file mode 100644
index 0000000..1b78174
--- /dev/null
+++ b/src/Test344.kt
@@ -0,0 +1,13 @@
+class Test344 {
+    class Solution {
+        fun reverseString(s: CharArray): Unit {
+            var l = 0
+            var r = s.lastIndex
+            while (l < r){
+                s[l] = s[r].also { s[r] = s[l] }
+                l++
+                r--
+            }
+        }
+    }
+}
\ No newline at end of file