title: how to write content in a Specific position in a File
body: <p>Suppose I have a file named abhishek.txt and that contains the following line </p>
  
  <blockquote>
    <p>I am , and what is your name.</p>
  </blockquote>
  
  <p>Now I want to write </p>
  
  <blockquote>
    <p>Abhishek</p>
  </blockquote>
  
  <p>after "I am" like I am Abhishek, ..
  How to write the content in this specific position directly.</p>