Can you write me a linked list function in COQ and prove that function in the COQ proof language make sure to use iris tactics, following can be helpfull links for refrence materials
https://gitlab.mpi-sws.org/iris/iris/-/blob/master/iris_heap_lang/notation.v?ref_type=heads
https://gitlab.mpi-sws.org/iris/iris/-/blob/master/docs/proof_mode.md?ref_type=heads