Delete text in one column from another column (variable)

Hello guys,

I have the following topic.

I have a table with the first two columns (First one: postal code, city, district of the city, sometimes the street and number, information about km which should be deleted).

The goal should be the last column:

Sometimes I have only the zip code and city (Row 1), sometimes the name of the street (Row 2), sometimes the whole adress with the number of the street, but no space between the information out of column 2 (Row 3). 

So I have to delete the text from column 2 out of column 1. 

Do you know how I can achieve that?

Thanks in advance!