title: Split column names in R
body: <p>I have a data frame like below. </p>
  
  <p>df:</p>
  
  <pre><code>X1.Name    X1.ID  X1.Prac   X1.SCD
  </code></pre>
  
  <p>But, I need to split the column name by dot and display as,</p>
  
  <p>output df:</p>
  
  <pre><code>Name   ID   Prac   SCD
  </code></pre>