title: Adding spaces in between String characters
body: <p>I am working on a data encryption program. I have completed the encryption part but the decryption part is a bit tricky. In my program I convert plain text to something like this:</p>
  
  <pre><code>public String cipher_stream = new String("2057216345135157862323621293695559030383785129357667531585938249534612483932237388388135819035165204");
  </code></pre>
  
  <p>the above String is actually the encrypted form of the plain text  </p>
  
  <pre><code>clearText = "hello this is bravo.";
  </code></pre>
  
  <p>now I want to add spaces to the String <code>cipher_stream</code> in a specific way. that is the first space should be inserted after 2 figure number then the second space should be inserted after three figure number then again a space should be inserted after 2 figure number and then again after three figure number..
  the String <code>cipher_stream</code> will look like this after inserting spaces in a specific pattern</p>
  
  <pre><code>public String cipher_code = new String(20 572 16 345 13 515 78 623 23 621 29 369 55 590 30 383 78 512 93 576 67 531 58 593 82 495 34 612 48 393 22 373 88 388 13 581 90 351 65 204);
  </code></pre>
  
  <p>I tried very hard but cannot figure out how to do it... please if any one of you can help me. Thanks for helping</p>