Add function that returns sum of all gear ratios in the engine schematic

Author: katzuv

puzzles/solutions/2023/d03/p2.py

@@ -1,8 +1,14 @@
 import sys
 
+from schematic_parser import SchematicParser
+
 
 def get_answer(input_text: str):
-    raise NotImplementedError
+    """Return the sum of all gear ratios in the engine schematic."""
+    schematic_parser = SchematicParser(input_text)
+    schematic_parser.find_part_numbers()
+    schematic_parser.find_gears()
+    return schematic_parser.calculate_gear_ratios_sum()
 
 
 if __name__ == "__main__":