测试通过，并写了中文自述文件

logger/logger.go

@@ -0,0 +1,32 @@
+package logger
+
+import (
+	"fmt"
+	"log"
+	"os"
+)
+
+type Logger struct {
+	logger *log.Logger
+	prefix string
+	pid    int
+}
+
+func New(prefix string) *Logger {
+	l := &Logger{logger: log.New(os.Stdout, "", log.LstdFlags)}
+	l.prefix = fmt.Sprintf("[%s - %d]", prefix, os.Getpid())
+	return l
+}
+
+func (l *Logger) Println(args ...interface{}) {
+	l.logger.Println(append([]interface{}{l.prefix}, args...)...)
+}
+
+func (l *Logger) Printf(format string, args ...interface{}) {
+	l.logger.Printf(l.prefix+" "+format, args...)
+}
+
+func (l *Logger) Fatalln(args ...interface{}) {
+	l.Println(args...)
+	os.Exit(-1)
+}