CareerCup Eliminate all ‘b’ and ‘ac’ in an array of characters

Eliminate all ‘b’ and ‘ac’ in an array of characters, you have to replace them in-place, and you are only allowed to iterate over the char array once. 

Examples: 
abc -> ac 
ac->'' 
rbact->rt

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The key point is in-place and iteration once.

 

 

int eliminate( char* p)
{
  int deleted = 0;
  if (! p )
    return deleted;
  while (*p){
    if (*p == 'b')
      deleted++;
    else if ( ( *p == 'a' ) && ( *(p+1) == 'c')){
      deleted += 2;
      p++;
    } 
    else if ( deleted > 0 )
      *(p-deleted) = *p;
    p++;
  }
  *(p-deleted) = '\0';
  return deleted;
}