found some bug

[Rabbit-bear]

gen_different_styles cant split mutated prompt normally

## promptwizard/glue/promptopt/techniques/critique_n_refine/core_logic.py
def gen_different_styles(self, base_instruction: str, task_description: str,
                         mutation_rounds: int = 2, thinking_styles_count: int = 10) -> List:    
......
        generated_mutated_prompt = self.chat_completion(mutated_sample_prompt)

        # the code cant split mutated prompt normally ,because TEXT_DELIMITER_PATTERN_MUTATION is error
        matches = re.findall(DatasetSpecificProcessing.TEXT_DELIMITER_PATTERN_MUTATION, generated_mutated_prompt) 
        candidate_prompts.extend(matches)
......
    return candidate_prompts


## promptwizard/glue/promptopt/techniques/common_logic.py
class DatasetSpecificProcessing(ABC):
......
# It should be like this '(?=</END>)' => '(?=<END>)'
    TEXT_DELIMITER_PATTERN_MUTATION = r"(?s)(?<=<START>)(.*?)(?=</END>)"   

gen_different_styles and get_prompt_score cant assemble mutated prompt normally

def gen_different_styles(self, base_instruction: str, task_description: str,
                         mutation_rounds: int = 2, thinking_styles_count: int = 10) -> List:
# base_instruction contains task_description
    candidate_prompts = [task_description + "\n" + base_instruction]
    
# but mutated instruction do not contains task_description
        matches = re.findall(DatasetSpecificProcessing.TEXT_DELIMITER_PATTERN_MUTATION, generated_mutated_prompt)
        candidate_prompts.extend(matches)


    return candidate_prompts