Remind Software Engineer interview questions

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Given a credit card number, find the issuer of the credit card based on the following rules: CC number starts with '4026', '417500', '4405', '4508', '4844', '4913', '4917' CC len : 16 Issuer : VISAELECTRON CC number starts with: '4' CC len : 16 Issuer: VISA CC number starts with: '34', '37' CC len : 15 Issuer : AMEX CC number starts with: '36' CC len : 14 Issuer : Diners Club TestCases: find_issuer('4175004175004172') == 'VISAELECTRON' find_issuer('4917491749174917') == 'VISAELECTRON' find_issuer('346416800707698') == 'AMEX' find_issuer('376416800707698') == 'AMEX' find_issuer('37641680070769832112') == 'UNAVAILABLE' find_issuer('36641680070769') == 'DC' find_issuer('54545641680070769') == 'UNAVAILABLE' find_issuer('4111111111111111') == 'VISA'