Sum of Cells in the blank cells in the next column. ( Formula or Appscript)

I want to sum the cells until I get a blank cell in the column B then add that sum in next column. In the below pic sum of C2:C4 should come in D5,sum of C6:C10 in D11 and so on. Database is so large. So filling formula in every column is not possible. Please find solution to this issue.