title: Convert csv coloumn data and output
body: <p>I have been given a hefty excel file containing a column of 'old' numbers and a column of 'new' numbers next to it.</p>
  
  <p>I have exported this as a csv file</p>
  
  <p>I need to create a html form which will allow the user to input their old number so that it will display the new number.</p>
  
  <p>Any help would be appreciated.</p>