public void AddJsonToStringbuilder(StringBuilder stringbuilder)
{
stringbuilder.Append("{characterSheet:{");
_race.AddJsonToStringbuilder(stringbuilder);
stringbuilder.Append(",");
_characterClass.AddJsonToStringbuilder(stringbuilder);
stringbuilder.Append(",");
_attributeSet.AddJsonToStringbuilder(stringbuilder);
stringbuilder.Append(",");
stringbuilder.Append("\"Proficiencies\":[");
stringbuilder.Append(string.Join(",", Proficiencies().Select(x => $"\"{x}\"")));
stringbuilder.Append("],");
stringbuilder.Append("}}");
}