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## itoabase
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### Instructions
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Write a function that:
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- converts an `int` value to a `string` using the specified base in the argument
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- and that returns this `string`
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The base is expressed as an `int`, from 2 to 16. The characters comprising
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the base are the digits from 0 to 9, followed by uppercase letters from A to F.
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For example, the base `4` would be the equivalent of "0123" and the base `16` would be the equivalent of "0123456789ABCDEF".
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If the value is negative, the resulting `string` has to be preceded by a
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minus sign `-`.
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Only valid inputs will be tested.
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### Expected function
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```go
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func ItoaBase(value, base int) string {
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}
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```
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