-camelCaseToTitleCase

- (NSString *)camelCaseToTitleCase {
  NSMutableString *string = [NSMutableString string];
  NSCharacterSet *upper = [NSCharacterSet uppercaseLetterCharacterSet];
  
  for (NSInteger index = 0; index < [self length]; index++) {
    NSString *character = [self substringWithRange:NSMakeRange(index, 1)];
    if ([character rangeOfCharacterFromSet:upper].location != NSNotFound) {
      [string appendString:@" "];
    }
    [string appendString:character];
  }
  
  return [string capitalizedString];
}