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ShowMeTheCircumference

package mainimport (    "fmt"    "math")type Circer interface {    Circ() float64}type Square struct {    side float64}type Circle struct {    diam, rad float64}func (s *Square) Circ() float64 {    return s.side * 4}func (c *Circle) Circ() float64 {    return c.diam * math.Pi}func ShowMeTheCircumference(name string, shape Circer) {    fmt.Printf("Circumference of %s is %fn", name, shape.Circ())}func main() {    square := &Square{side: 2}    circle := &Circle{diam: 10}    ShowMeTheCircumference("square", square)    ShowMeTheCircumference("circle", circle)}

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