Kind of 3D platformer help

I was working on some code to make a 3d platformer from 3rd person view. Of course, it is not actual 3d with perspective and that stuff, it just looks like it is 3d.

I need help with the collisions. If you jump and then move sideways you noclip into a platform. I want to make it so that the edge of the platform is a wall, so you have to jump onto the top of the platform to get onto it.

Can anybody help?

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