title: Why tr gives me double char, when I use special characters?
body: <p>I have next problem;</p>
  
  <pre><code>$ echo ača | tr 'č' 'c'
  $ acca
  </code></pre>
  
  <p>Why it gives mi double "c" ? How to solve that? I want <code>aca</code>, not <code>acca</code>.</p>