Fix PrefixLineBreaks cross-platform bug

Author: christianhelle

src/HttpGenerator.Core/StringExtensions.cs

@@ -56,10 +56,6 @@ public static string Prefix(this string str, string prefix)
 
     public static string? PrefixLineBreaks(this string value, string prefix = "###") =>
         value
-            ?.Replace(
-                Environment.OSVersion.Platform == PlatformID.MacOSX ||
-                Environment.OSVersion.Platform == PlatformID.Unix
-                    ? "\r\n" // Environment.NewLine value for non-Unix platforms
-                    : "\n", // Environment.NewLine value for Unix platforms
-                $"{Environment.NewLine}{prefix} ");
+            ?.Replace("\r\n", "\n")
+            .Replace("\n", $"{Environment.NewLine}{prefix} ");
 }