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How can I create a square keeping only the cornes? I've tried clipping masks and I end up with the opposite result.
There are probably several ways to go about it, here are the steps for one of them...
If you need finer control over the exact size.
Draw these 3 shapes, option click to enter sizes, and align center on both axis
Unite the red shapes, then subtract from the bottom shape using pathfinder. In outline mode with the hollow arrow tool draw a frame to select and delete these 4 points.
Another method is using a Knockout Group.
Add 2 fill to the stroked rectangle.
Use Effect > Convert to Shape > Rectangle to create 2 rectangles that cover the unwanted stroke areas.
Set the Opacity of both fills to 0%
Set the Opacity option below the Stroke and Fills to Knockout Group.
You can change everything if necessary.
Based on a stroked path with Butt Cap and Round Join you can also use Dashed line to get the desired appearance with the right values of Dash and Gap as described here,
when you search the page for "Align Dashes to Corners and Path Ends, Adjusting Length to Fit"