Big numbers in data.txt crashes application

[nus-se-script]

Description: When a user runs the application after changing a number in data.txt to a very large number, the application crashes on startup.

Steps to Reproduce:

1. Open data.txt in the data folder
2. Change any integer value to a very large number, e.g. 99999999999999999999999
3. Run the jar file

Actual Result: The application crashes on startup, throwing a RuntimeException for a NumberFormatException.

Screenshot:

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_{[original: nus-cs2113-AY2324S2/pe-interim#808] [original labels: type.FunctionalityBug severity.High]}

[nikhil-2101]

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