setting up hyperlinks are not keeping full url path

When I create a hyperlink in markdown, if I do not leave a trailing `/` it will not keep the sub path when in the sub folder.

index.md 

```
* [lesson1](1-lesson1/)
```

then inside the path `/lesson1` I can reference local files

```
[Exercises](/exercises)
```

At some point I should be able to just to include the name of the path without the slash and it should remember the path. 