diff --git a/src/interpreter/LispInterpreterBuilderImpl.java b/src/interpreter/LispInterpreterBuilderImpl.java
index bc8eb46..f9ab7e1 100644
--- a/src/interpreter/LispInterpreterBuilderImpl.java
+++ b/src/interpreter/LispInterpreterBuilderImpl.java
@@ -6,9 +6,9 @@ import environment.RuntimeEnvironment;
 import error.*;
 
 public class LispInterpreterBuilderImpl implements LispInterpreterBuilder {
-    
+
     private static LispInterpreterBuilder uniqueInstance = new LispInterpreterBuilderImpl();
-    
+
     public static LispInterpreterBuilder getInstance() {
         return uniqueInstance;
     }
@@ -88,7 +88,7 @@ public class LispInterpreterBuilderImpl implements LispInterpreterBuilder {
     public class InterpreterAlreadyBuiltException extends LispException {
 
         private static final long serialVersionUID = 1L;
-        
+
         @Override
         public int getSeverity() {
             return ErrorManager.CRITICAL_LEVEL;