add: pluralize int extension

TakasakiStudio.Lina.Utils/Extensions/IntegerExtensions.cs

@@ -0,0 +1,24 @@
+namespace TakasakiStudio.Lina.Utils.Extensions;
+
+/// <summary>
+/// Utility integer extensions
+/// </summary>
+public static class IntegerExtensions
+{
+    /// <summary>
+    /// Return singular or plural string depending on the value, e.g. 1 item, 2 items
+    /// If plural is not provided, it will be the singular + 's'.
+    /// If the value is 1 or -1, the singular will be returned, otherwise the plural.
+    /// </summary>
+    /// <param name="value">The quantity value</param>
+    /// <param name="singular">The word in singular</param>
+    /// <param name="plural">The word in plural. Defaults to the singular + 's'</param>
+    /// <param name="prependValue">Prepend the value to the word. Defaults to true.</param>
+    /// <returns>The desired word</returns>
+    public static string Pluralize(this int value, string singular, string? plural = null, bool prependValue = true)
+    {
+        plural ??= singular + "s";
+        var word = Math.Abs(value) == 1 ? singular : plural;
+        return prependValue ? $"{value} {word}" : word;
+    }
+}