remove end of line

This program opens v1.txt. Then it will check every line for the keyword rt7w. It will remove the word rt7w and everything what comes after it. Then it will print the result in to the file v2.txt. For example you have a list of urls with descriptions (http://www.domain.com/ here is the description). Then it will print only http://www.domain.com/ (if you change the entry rt7w into here). You can even edit the number 0 (if you want to delete the beginning for example the a href= part).