TEST

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A
 const IbanUtils = {
  maskIban: (iban) => {
    const firstPart = iban.slice(0, 4)
    const lastPart = iban.slice(-3)
    const maskedLength = iban.length - 7
    const maskedPart = '*'.repeat(maskedLength)

    return `${firstPart}${maskedPart}${lastPart}`
  },
}

IbanUtils.maskIban('FR763000600001123456189')
ready
B
const maskIban= (iban) => {
    const firstPart = iban.slice(0, 4)
    const lastPart = iban.slice(-3)
    const maskedLength = iban.length - 7
    const maskedPart = '*'.repeat(maskedLength)

    return `${firstPart}${maskedPart}${lastPart}`
}

maskIban('FR763000600001123456189')
ready

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