[CHANGE] - Retrun statement of common code of the extraction bricks needs to be reworked 

Currently, we return an `extraction_keyword` with all extraction bricks, which is passed to the function of the brick and then returned again, which is not efficient. Instead it might make more sense to return `<value>`, `<start_char_idx>`, `<end_char_idx>`. This need to be then applied for all bricks. 
