This is easy.
One way would be to delete all (if any) interior vertices in the lightning bolt, just leave the shape’s outline edges and verts. Then manually add 4 verts right where you see the central Z shape in the original logo. Then move these 4 verts up in the +z axis to get the shape into 3D. Also connect these verts to the other nearest verts. Finally, select all verts and press f to make them into faces.