If your column A data starts at row 2,
enter "unicore" in cell B1
In cell B2 enter this formula:
=B$1& " " &A2Note the $ sign.
Drag the formula down as many rows as you have data in column A.
Now select all the cells with the unicore prefix in column B. Copy
Then select the first cell with data in Column A and right-click,
PasteSpecial - select Values, and OK.
(Make a copy of your data before trying this)
Delete column B.
If column B is not available, any column will do, e.g. place "unicore" in cell Z1
and the formula in Z2 is:
=Z$1& " " &A2