Need Loop code to Copy data or pass values

Hi I have inherited some files that will need to be updated monthly. The data is sales information. The problem is it has gaps in columns and rows that need populating. I have tried using a DO/Loop statement with ActiveCell to do this but can't get the logic right. I have attached a spreadsheet with a dummy example of before and after. Accomplishing this with code will save me hours of work each month.
As you can see my code is flawed but hopefully you can see what I am trying to accomplish.
If anyone can help I would be really grateful.

PHP Code: 

Sub Copydata()
Dim MyCell As String
Dim i As Integer
'i = 2314
'Do Until IsEmpty(Cells(i, 2))
For i = 1 To 2314 Step 1
Range("c3").Select
MyCell = ActiveCell.Value

If ActiveCell.Offset(1, 0).Value = "" Then
ActiveCell.Offset(1, 0).Select
ActiveCell.Value = MyCell
    
Else: ActiveCell.Offset(1, 0).Select
MyCell = ActiveCell.Value

End If
ActiveCell.Offset(1, 0).Select
i = i + 1

Next i
ActiveCell.Offset(1, 0).Select
End Sub[ 


Fantastic,
Thanks for the help. Now I just need to get my head around the code your neat piece of code.
Really appreciate it.