Add char extensions: Repeat and AsString

PowerKit.Tests/CharExtensionsTests.cs

@@ -0,0 +1,25 @@
+using FluentAssertions;
+using PowerKit.Extensions;
+using Xunit;
+
+namespace PowerKit.Tests;
+
+public class CharExtensionsTests
+{
+    [Fact]
+    public void Repeat_Test()
+    {
+        // Act & assert
+        'a'.Repeat(3).Should().Be("aaa");
+        'x'.Repeat(1).Should().Be("x");
+        'z'.Repeat(0).Should().Be("");
+    }
+
+    [Fact]
+    public void AsString_Test()
+    {
+        // Act & assert
+        'a'.AsString().Should().Be("a");
+        ' '.AsString().Should().Be(" ");
+    }
+}

PowerKit/Extensions/CharExtensions.cs

@@ -0,0 +1,23 @@
+#nullable enable
+using System.Diagnostics.CodeAnalysis;
+
+namespace PowerKit.Extensions;
+
+#if !POWERKIT_INCLUDE_COVERAGE
+[ExcludeFromCodeCoverage]
+#endif
+internal static class CharExtensions
+{
+    extension(char c)
+    {
+        /// <summary>
+        /// Returns a string that contains the character repeated the specified number of times.
+        /// </summary>
+        public string Repeat(int count) => new(c, count);
+
+        /// <summary>
+        /// Returns a string that contains only this character.
+        /// </summary>
+        public string AsString() => c.Repeat(1);
+    }
+}