how can I get the data on the left to now have an empty row in between each room number?

Original Result
Room # Room Room # Room
a1 kitchen a1 kitchen
a2 bedroom
a3 living room a2 bedroom
dining room
a4 stairs a3 living room
a5 restroom dining room
powder
a6 lobby a4 stairs
a5 restroom
powder
a6 lobby


Code:
// Table1
let
    Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
    FD = Table.FillDown(Table.DuplicateColumn(Source, "Room #", "Room # - Copy"),{"Room # - Copy"}),
    Grp = Table.Group(FD, {"Room # - Copy"}, {{"All", each Table.InsertRows(_, Table.RowCount(_), {[#"Room #"=null, Room=null, #"Room # - Copy"=null]})}}),
    RC = Table.RemoveColumns(Table.ExpandTableColumn(Grp, "All", {"Room #", "Room"}, {"Room #", "Room"}),{"Room # - Copy"})
in
    RC