How to combine merge two columns?

I have two columns of text that I want to combine (but not concatentate) e.g.

The first column has no nulls but I want to replace wqith a value from column two.
Column two has nulls but I dont want to overwrite column 1 with these nulls i.e. I want to keep column 1 text.

Please see attached example.

I hvae minimal experience with this kind of excel problem.

Thanks

M

Thanks benishiryo, that does the job

cheers

M