Variadic functions parameters pass-through

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Variadic functions receive the arguments as a slice of the type. In this case your function receives a []interface{} named args. When you pass that argument to fmt.Sprintf, you are passing it as a single argument of type []interface{}. What you really want is to pass each value in args as a separate argument (the same way you received them). To do this you must use the ... syntax.

str := fmt.Sprintf(format, args...)

This is also explained in the Go specification here.

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