Minor update to the Environment class

src/environment/Environment.java

@@ -4,10 +4,10 @@ import java.io.*;
 
 public class Environment {
 
-    private static final Environment instance = new Environment();
+    private static Environment uniqueInstance = new Environment();
 
     public static Environment getInstance() {
-        return instance;
+        return uniqueInstance;
     }
 
     private InputStream input;