update,

_prompts/step3/prompt.md

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+write some cpp functions:
+
+- User can add, edit and delete the record to the system manually or upload a file.
+
+using cpp, write a console program that accepts:
+  user input a csv file path
+
+the program then parse the inputted csv file and insert the record
+
+```
+name,maths,chinese,english
+apple,99,98,99
+banana,99,98,99
+```
+
+