Update myfile.go

myfile/myfile.go

@@ -3,14 +3,15 @@ package myfile
 import (
 	"fmt"
 	"path"
+	"strings"
 	"time"
 
 	"github.com/xxjwxc/public/tools"
 )
 
 // GetExp 获取字符串后缀
-func GetExp(exp string) string {
-	return path.Ext(exp) //获取文件后缀
+func GetExp(ext string) string {
+	return strings.TrimLeft(path.Ext(ext), ".")
 }
 
 func getFileName(exp string) string {