new currency's abbreviation

[nus-pe-bot]

stats that it only accepts currency's abbreviation in three-letter abbreviation name. Example: sgd but accepted "r d" or "rd " as a currency abbreviation

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_{[original: nus-cs2113-AY2223S1/pe-interim#889] [original labels: type.FeatureFlaw severity.Medium]}

[markusteim]

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