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## itoabase
### Instructions
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Write a function that:
- converts an `int` value to a `string` using the specified base in the argument
- and that returns this `string`
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".
If the value is negative, the resulting `string` has to be preceded with a
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minus sign `-`.
Only valid inputs will be tested.
### Expected function
```go
func ItoaBase(value, base int) string {
}
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```