Initial commit

vscode/Chapter04/Ch04Ex02PrimeFactorsLib/Ch04Ex02PrimeFactorsLib.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

vscode/Chapter04/Ch04Ex02PrimeFactorsLib/Primes.cs

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+namespace Ch04Ex02PrimeFactorsLib
+{
+  public class Primes
+  {
+    public static int[] PrimeNumbers = new[]
+        {
+      97, 89, 83, 79, 73, 71, 67, 61, 59, 53,
+      47, 43, 41, 37, 31, 29, 23, 19, 17, 13,
+      11, 7, 5, 3, 2
+    };
+
+    public static string PrimeFactors(int number)
+    {
+      string factors = string.Empty;
+
+      foreach (int divisor in PrimeNumbers)
+      {
+        int remainder;
+        do
+        {
+          remainder = number % divisor;
+          if (remainder == 0)
+          {
+            number = number / divisor;
+            if (number == 1)
+            {
+              factors += $"{divisor}";
+            }
+            else
+            {
+              factors += $"{divisor} x ";
+            }
+          }
+        } while (remainder == 0);
+      }
+      return $"{factors}";
+    }
+  }
+}