title: Merge two strings in kotlin
body: <p>I have two strings</p>
  
  <pre><code>val a = "abc"
  val b = "xyz"
  </code></pre>
  
  <p>I want to merge it and need output like below</p>
  
  <blockquote>
    <p><strong>axbycz</strong></p>
  </blockquote>
  
  <p>I added both strings to arraylist and then flatmap it</p>
  
  <pre><code>val c = listOf(a, b)
  
  val d = c.flatMap {
      it.toList()
  }
  </code></pre>
  
  <p>but not getting the desired result</p>