title: swift : use of %s in String(format: ...)
body: <p>I would like to format a string with another string like this:</p>
  
  <pre><code>var str = "Hello, playground"
  print (String(format: "greetings %s", str))
  </code></pre>
  
  <p>This leads to this beautiful result:</p>
  
  <blockquote>
    <p>greetings 哰૧   </p>
  </blockquote>
  
  <p>I tried with %@ and it works but, as I'm getting format string from
  another programming language, I would like, if possible to use the %s tag.
  Is there a way to ?</p>