fix(mini): println warning

3methods/interfaces.go

@@ -127,7 +127,7 @@ func main() {
 	// f3 := i4.(float64) // panic: interface conversion: interface {} is string, not float64
 	// fmt.Println(f3)
 
-	fmt.Println("\n\n")
+	fmt.Printf("\n\n")
 	fmt.Println("You can also use interfaces for getting a variable as argument and then deciding type of this variable. var.(type) returns interfaces type. And then you can check different types with switch-case")
 	somevar(61)
 	somevar("hello")