Eliminate double-spaced output from Textifier

.gitignore

@@ -4,7 +4,11 @@ build/
 
 # Files generated by Eclipse
 **/.classpath
-**/.gitignore
 **/.project
 **/.settings/
 **/bin/
+
+# Files generated by IntelliJ
+.idea/
+out/
+*.iml

asm-util/src/main/java/org/objectweb/asm/util/Textifier.java

@@ -191,15 +191,16 @@ public class Textifier extends Printer {
     if (superName != null && !"java/lang/Object".equals(superName)) {
       stringBuilder.append(" extends ");
       appendDescriptor(INTERNAL_NAME, superName);
-      stringBuilder.append(' ');
     }
     if (interfaces != null && interfaces.length > 0) {
       stringBuilder.append(" implements ");
       for (int i = 0; i < interfaces.length; ++i) {
         appendDescriptor(INTERNAL_NAME, interfaces[i]);
+        if (i != interfaces.length - 1) {
           stringBuilder.append(' ');
         }
       }
+    }
     stringBuilder.append(" {\n\n");
 
     text.add(stringBuilder.toString());