title: Match string, copy line to next line and modify string using sed
body: <p>I have a file that contains 2 lines </p>
  
  <ul>
  <li>Line1: " My name is ABCD".</li>
  <li>Line2 "My name is XYZ". </li>
  </ul>
  
  <p>I want to copy ALL lines with string "My name" and paste the entire line on the next line but also change the  line with new string. EG: New file should look like:</p>
  
  <ul>
  <li>Line1: "My name is ABCD" </li>
  <li>Line2:"My name is ABCD and age 2" </li>
  <li>Line3: "My name is XYZ"</li>
  <li>Line4: "My name is XYZ and age 2" </li>
  </ul>