Function SCIPgetPrioSibling 

pub unsafe extern "C" fn SCIPgetPrioSibling(
    scip: *mut SCIP,
) -> *mut SCIP_NODE

gets the best sibling of the focus node w.r.t. the node selection priority assigned by the branching rule

@return the best sibling of the focus node w.r.t. the node selection priority assigned by the branching rule

@pre This method can be called if @p scip is in one of the following stages: - \ref SCIP_STAGE_SOLVING