WindowsPathChecker - A simple console application to check the validity of paths

WindowsPathChecker.cs

//***********************************************************************
// WindowsPathChecker
//   A simple console application to check
//   the validity of paths in the Windows PATH environment variable.
//***********************************************************************

namespace WindowsPathChecker {
    internal class Program {
        static void Main( string[] args ) {
            // Get the value of the PATH environment variable
            string path = Environment.GetEnvironmentVariable( "PATH" ) ?? "";
            // Split the PATH value by semicolon and store in an array
            string[] paths = path.Split( ';', StringSplitOptions.RemoveEmptyEntries );
            // Use HashSet for duplicate checking
            HashSet<string> uniquePaths = new HashSet<string>( StringComparer.OrdinalIgnoreCase );

            // For each path
            foreach ( string p in paths ) {
                // Check if the path exists
                bool exists = Directory.Exists( p );
                // Check if the path is duplicated
                bool isDuplicate = !uniquePaths.Add( p );

                // Display the result
                string result = "";
                if ( !exists ) {
                    result += "X";
                }
                if ( isDuplicate ) {
                    result += "D";
                }
                Console.WriteLine( $"{result}\t{p}" );
            }
        }
    }
}