code: def fuse_wheels(to_wheel, from_wheel, out_wheel):
      
      to_wheel, from_wheel, out_wheel = [
          abspath(w) for w in (to_wheel, from_wheel, out_wheel)]
      with InTemporaryDirectory():
          zip2dir(to_wheel, 'to_wheel')
          zip2dir(from_wheel, 'from_wheel')
          fuse_trees('to_wheel', 'from_wheel')
          rewrite_record('to_wheel')
          dir2zip('to_wheel', out_wheel)
docs: Fuse `from_wheel` into `to_wheel`, write to `out_wheel`
  
      Parameters
      ---------
      to_wheel : str
          filename of wheel to fuse into
      from_wheel : str
          filename of wheel to fuse from
      out_wheel : str
          filename of new wheel from fusion of `to_wheel` and `from_wheel`