core: typos and comments improve

1. fix typos
2. methods recevier of struct should be same
3. comments improve

(cherry picked from commit 1ba979539582a00b7fd1a7c8a37a6852e59eac0d)

1 files changed, 6 insertions, 8 deletions

diff --git a/core/helper_test.go b/core/helper_test.go
index fd6a5491c..698a2924c 100644
--- a/core/helper_test.go
+++ b/core/helper_test.go
@@ -21,8 +21,6 @@ import (
 	"fmt"
 
 	"github.com/ethereum/go-ethereum/core/types"
-	// "github.com/ethereum/go-ethereum/crypto"
-
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/event"
 )
@@ -38,24 +36,24 @@ type TestManager struct {
 	Blocks     []*types.Block
 }
 
-func (s *TestManager) IsListening() bool {
+func (tm *TestManager) IsListening() bool {
 	return false
 }
 
-func (s *TestManager) IsMining() bool {
+func (tm *TestManager) IsMining() bool {
 	return false
 }
 
-func (s *TestManager) PeerCount() int {
+func (tm *TestManager) PeerCount() int {
 	return 0
 }
 
-func (s *TestManager) Peers() *list.List {
+func (tm *TestManager) Peers() *list.List {
 	return list.New()
 }
 
-func (s *TestManager) BlockChain() *BlockChain {
-	return s.blockChain
+func (tm *TestManager) BlockChain() *BlockChain {
+	return tm.blockChain
 }
 
 func (tm *TestManager) TxPool() *TxPool {