Update the code for the 'FullName' property to pass the test

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// {...}
    public class SalesPerson
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public decimal TotalSales { get; set; }
        public string FullName => "";
        public decimal CalculateCommission(decimal percentage) => percentage;
    }
// {...}
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