https://www.icts.uiowa.edu/confluence/display/REDCapDocs/Preserving+Prefixed+Zeros+in+Excel with the help of the above link i prefixed the 0 in excel.

Now i want to concatenate these columns A &B to C.

Please let me know how to do that.

```
Example:
column A column B column C
06789 00054 Expected: 0678900054
Actual: 0678954
```