public static string GetUserStoryYaml(UserStory userStory)
{
var yamlProperties = userStory.ToYamlProperties();
var utcIsoConverter = new DateTimeConverter(kind: DateTimeKind.Utc, formats: UtcIsoFormatString);
var serializer = new SerializerBuilder()
.WithTypeConverter(utcIsoConverter)
.Build();
string yaml = serializer.Serialize(yamlProperties);
string final = $"{YamlStartToken}{yaml.Trim() + Environment.NewLine}{YamlEndToken}{Environment.NewLine}";
return(final.NormalizeYamlLineEndings());
}