77. implement BigInt subtraction with sign
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easy - accepted / - tried
This is a follow-up on 75. implement BigInt subtraction.
You are asked to implement a string substraction function, with possible negative integers. Also, '+' plus sign should also be supported
substract('-999999999999999999', '-1')
// '-999999999999999998'
substract('-999999999999999999', '+1')
// '-1000000000000000000'
Don't use BigInt directly, it is not our goal here.