Refactor: search_single_survivors() to reduce code duplication
Refactor: search_single_survivors() to reduce code duplication

mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs