fix golint error

cmd/merge_test.go

@@ -27,7 +27,7 @@ import (
 )
 
 // use a variable to record if the tested function has failed
-// so unittest can only be exectued sequential
+// so unittest can only be executed sequential
 var fatal = false
 var fatalStr string
 

tests/samples/gomod_replace_library/bar.go

@@ -2,6 +2,7 @@ package foo
 
 import "fmt"
 
+//Bar fake method
 func Bar() {
 	fmt.Println("foo bar")
 }