Add whitespace before and after a string in ruby? -

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I want to add a white space before and after the random string.

I "Random_string" center (1, "") but this does not work.

Thank you

My Ruby is wild, but nothing is wrong with IMO Do not have 

  DRF pad (random) "+ + random +" "end padded_random_string = pad (" random_string ")   
 
 
  "random_string" .center ("random_string" .length + 2)

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