fix: Processing for document export sheet with more than 32 characters

[shaohuzhang1]

fix: Processing for document export sheet with more than 32 characters

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[shaohuzhang1]

The function reset_document_name has a few improvements that can be made to enhance its readability and potentially reduce redundancy:

1. Stripping Whitespace: The line document_name.strip() is redundant inside the condition if document_name is not None, as it would have been stripped anyway before entering the conditional.

2. Truncating Document Name: While trimming the string to 29 characters might be useful for formatting in some contexts, it should be done based on user preferences rather than automatically changing lengths throughout the application's execution.

Here's an optimized version of the code:

class MergeProblemHelper:
    @staticmethod
    def reset_document_name(document_name):
        """Resets the document name with specific rules."""
        # Strip leading and trailing whitespace
        document_name = document_name.strip()
        
        # Check if document name is valid
        if document_name is None or not Utils.valid_sheet_name(document_name):
            return "Sheet"
        
        # Truncate document name (optional), e.g., for filename purposes
        document_name = document_name[:29].strip()
        
        return document_name
    
    # ... other static methods ...

This refactoring makes each step clear and removes unnecessary logic, maintaining the original functionality while being more efficient and easier to understand.