Legs / shoes not deforming correctly

Hey thanks for reading this .

So the problem is obvious but i lack of knowledge to resolve it .
I don’t get why the shoes goes like this when i move the ik handle .
Anyidea ?

Blendfile : https://easyupload.io/zheslq

So i though i would have more answers here than stackoverflow …
But i guess that means it’s a comon problem to have a big hole between the leg and the shoes while using ik…will have to live with it .