update

Author: ngtduc693

Algorithms/Other/Luhn.cs

@@ -10,10 +10,22 @@ namespace Algorithms.Other;
 /// </summary>
 public static class Luhn
 {
-    // Checking the validity of a sequence of numbers.
+    /// <summary>
+    ///     Checking the validity of a sequence of numbers.
+    /// </summary>
+    /// <param name="number">The number that will be checked for validity.</param>
+    /// <returns>
+    ///     True: Number is valid.
+    ///     False: Number isn`t valid.
+    /// </returns>
     public static bool Validate(string number) => GetSum(number) % 10 == 0;
 
-    // Finds one missing digit. In place of the unknown digit, put "x".
+    /// <summary>
+    ///     This algorithm finds one missing digit.
+    ///     In place of the unknown digit, put "x".
+    /// </summary>
+    /// <param name="number">The number in which to find the missing digit.</param>
+    /// <returns>Missing digit.</returns>
     public static int GetLostNum(string number)
     {
         var missingDigitIndex = number.Length - 1 - number.LastIndexOf('x');
@@ -26,7 +38,11 @@ public static int GetLostNum(string number)
                 : (checkDigit + 9) / 2;
     }
 
-    // Computes the sum found by the Luhn algorithm, optimized with Span.
+    /// <summary>
+    ///     Computes the sum found by the Luhn algorithm.
+    /// </summary>
+    /// <param name="number">The number for which the sum will be calculated.</param>
+    /// <returns>Sum.</returns>
     private static int GetSum(string number)
     {
         var sum = 0;