Use errors.New instead of fmt.Errorf to create NoMoreBlocksErr in interleaver.

interleaver/interfaces.go

@@ -5,12 +5,12 @@
 package main
 
 import (
-	"fmt"
+	"errors"
 
 	"bitbucket.org/s_l_teichmann/mtredisalize/common"
 )
 
-var NoMoreBlocksErr = fmt.Errorf("No more blocks.")
+var NoMoreBlocksErr = errors.New("No more blocks.")
 
 type (
 	Block struct {

interleaver/main.go

@@ -5,5 +5,5 @@
 package main
 
 func main() {
-    // TODO: Implement me!
+	// TODO: Implement me!
 }