Microsoft Phone Interview

Just had a phone interview from Microsoft, which ends really fast (22min or so), so I guess I didn't do too well?

The interviewer didn't ask a lot. Three non-technical questions
1. Why do you choose software development (instead of testing etc). Answer, I like designing stuff blah...
2. What's the project you like most or most challenging, answered with one of my research, but I doubt I explained that well.
3. What's the software you like most, asked if webservices are ok, and answered with gmail (BIG MISTAKE!).

The technical question is from the book "Programming Interviews Exposed: Secrets to Landing Your Next Job (Programmer to Programmer)", asked me to code a C routine to remove characters. So just give answer from the book.
Question: Implement the following
void Remove(char* string, char* delims);
Input/output example:
"hello world", "low"
"he rd"