Moving the contents one cell up in a column

Hello,
In my excel sheet the column C has contents in alternate cells starting from C1 till end. It looks like
C
1 heading
2
3 d1
4
5 d2
6
. .
. .

Now i want to move the content one cell up in the column except the heading. It should look like
C
1 heading
2 d1
3
4 d2
5
6 d3
. .
. .

Can u give the code for this modification.

Thank you