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merging and copying files to anther directory

I need some immediate help with this:
suppose i would generate two files, file a and file b,c
file a's path is /usrs/extracts/work/a.txt
file b's path and name: /users/extracts/work/b.txt
/users/extracts/wrok/c.txt

I need to do these:
1. before i generate files in work dir, clean/delete all files in this dir. how to do that? using system( ) func?
2. Then i generated two files in this dir, a and b. how to merger them(append them) to anther dir /users/extracts/ready dir to have a final file:
/users/extracts/ready/d.txt? Any code there which would efficiently doing that(speed and correctness)? a.txt and b.txt, c.txt might be big and each has thousands of record with each record 80bytes.
thanks for help

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rajeev_devin

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pigyc

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how is the speed of this cat method?
I read about ways of something like this,using append method. Facing these two choices , what you would choose interms of speed and correctness, and why?

...open c.txt for read, and get c_fptr.....--->should it open for append instead of read for c.txt??

while(fgets(linebuff, sizeof(linebuff), a_fptr)
if(fputs(linebuff, c_fptr)==EOF){
fclose(a_fptr); ---->should it close c_fptr instead??
}

if(!feof(a_fptr))
fclose(a_fptr);

..do the samething to b.txt to append to c.txt.....

fclose(c_fptr);