title: Ruby String merge
body: <p>I would like to merge Strings in Ruby 1.8.7, please help.</p>
  
  <pre><code>s1 = "abc(1,,,,)"
  s2 = "abc(,,3,,)"
  s3 = "abc(,2,,,)"
  s4 = "abc(,,,,5)"
  </code></pre>
  
  <p>and the output should be:</p>
  
  <pre><code>s = "abc(1,2,3,,5)"
  </code></pre>
  
  <p>Is there any in-built function available in Ruby 1.8.7 to achieve this?</p>