Your are given a string. You must replace the word(s) coverage by covfefe, however, if you don't find the word coverage in the string, you must add it at the end of the string with a leading space.

def covfefe(tweet)
  standardized_tweet = tweet.downcase.gsub(/\W/, " ")
  if !standardized_tweet.include?("coverage")
    tweet + " covfefe"
  else
    standardized_tweet.split(" ").map {|word| word == "coverage" ? "covfefe" : word}.join(" ")
  end
end

Twitter needs to implement this script into their platform ¯\_(ツ)_/¯