[fix #10] Euen.10.sse

[fix #10] Euen.10.sse
You have to contemplate the possibility of already having a process for this user/match. In that case, you have to close the old process and register this one.
You should also do that in one step (i.e. `try erlang:register(ProcessName, self()) …`) not in two (i.e. `whereis` and `register`) because `whereis` may return `undefined` but, before you get to `erlang:register` another process may have been registered with the same name.