title: Split one column (string) from csv file into three
body: <p>This probably was asked millions of times, but I can't find a proper answer, really.</p>
  
  <p>Basically, I have a huge .csv file to download data from and to insert it into a local one. It has 10 columns, and the third one is just a string, which always has the same "type" of string. something like: 123/45K67.</p>
  
  <p>I just want to split it into three columns: 123, 45, K67 and exclude the slash totally.</p>
  
  <p>Sorry for bad formatting, writing from mobile. </p>