Re-structure the project.

src/normalize/normalizers/ocr_normalizer.py

@@ -0,0 +1,31 @@
+"""
+OCR Number Normalizer
+
+Normalizes OCR reference numbers (Swedish payment system).
+"""
+
+import re
+from .base import BaseNormalizer
+
+
+class OCRNormalizer(BaseNormalizer):
+    """
+    Normalizes OCR reference numbers.
+
+    Similar to invoice number - primarily digits.
+
+    Examples:
+        '94228110015950070' -> ['94228110015950070']
+        'OCR: 94228110015950070' -> ['94228110015950070', 'OCR: 94228110015950070']
+    """
+
+    def normalize(self, value: str) -> list[str]:
+        """Generate variants of OCR number."""
+        value = self.clean_text(value)
+        digits_only = re.sub(r'\D', '', value)
+
+        variants = [value]
+        if digits_only and digits_only != value:
+            variants.append(digits_only)
+
+        return list(set(v for v in variants if v))