title: remove suffix from column names using rename_at in r
body: <p>I have a dataframe with many columns ending in the same suffix, and I want to use rename_at() to remove them all, but I can't figure it out.</p>
  <pre><code>library(tidyverse)
  
  my_df &lt;- tibble(id = c(1, 2), 
  jan_real = c(8, 10),
  feb_real = c(9, 10),
  mar_real = c(1, 11))
  
  desired_df &lt;- tibble(id = c(1, 2), 
  jan = c(8, 10),
  feb = c(9, 10),
  mar = c(1, 11))
  </code></pre>