public double CalculatePercentationOfTweetsThatContainEmojis()
{
var tweets = _tweetRepository.ReadAll().ToList();
var tweetCount = tweets.Count();
var tweetsWithEmojisCount = tweets.Count(t => t.ContainsEmojis);
var percentageOfTweetsWithEmojis = (double)tweetsWithEmojisCount / (double)tweetCount;
return(Math.Round(percentageOfTweetsWithEmojis * 100, MidpointRounding.AwayFromZero));
}