public override string ToString()
{
var modified = new Dictionary <Charge, int>();
Charges.ForEach(self =>
{
if (modified.ContainsKey(self))
{
modified[self] += 1;
}
else
{
modified.Add(self, 1);
}
});
return($"{string.Join(", ", modified.Select(self => $"{self.Key} x{self.Value}"))} ({IssuedAt:MM/dd/yyyy HH:mm:ss})");
}