ExcelVBA-In a column, change only cells that

Hello,

In Excel VBA, In a column, I want to change only cells that has only one character and add a "0" (zero) prefix.

for example if column C contains the data below,

0
1
0
7
2
0
31
10
0
1

I want to replace those with only one character and add a 0 prefix to look like

00
01
00
07
02
00
31
10
00
01

Can anyone please help how to code this in Excel VBA?

Thanks