fix

Author: counter2015

os/src/ZipOps.scala

@@ -155,17 +155,23 @@ object zip {
 
     val fis = if (os.isFile(file)) Some(os.read.inputStream(file)) else None
 
-    val path = if (os.isDir(file)) sub.toString + "/" else sub.toString
-    try makeZipEntry0(path, fis, mtimeOpt, zipOut)
+    try makeZipEntry0(sub, fis, mtimeOpt, zipOut)
     finally fis.foreach(_.close())
   }
 
   private def makeZipEntry0(
-      path: String,
+      sub: os.SubPath,
       is: Option[java.io.InputStream],
       preserveMtimes: Option[Long],
       zipOut: ZipOutputStream
   ) = {
+    val path = is match {
+      // for folder
+      case None => sub.toString + "/"
+      // for file
+      case Some(_) => sub.toString
+    }
+
     val zipEntry = new ZipEntry(path)
 
     preserveMtimes match {