start anew. re-think the GUI to add menu's to widgets

.gitignore

@@ -0,0 +1,4 @@
+*.swp
+go.mod
+go.sum
+junk

Makefile

@@ -0,0 +1,18 @@
+all:
+	@#GO111MODULE=off go build
+	@GO111MODULE=off go vet -x
+	@echo this go library package builds okay
+
+build:
+	@GO111MODULE=off go build -x -o junk
+	./junk
+
+goimports:
+	goimports -w *.go
+
+redomod:
+	rm -f go.*
+	goimports -w *.go
+	GO111MODULE= go mod init
+	GO111MODULE= go mod tidy
+

area.go

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+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+type Circle struct {
+	Radius float64
+}
+
+func (c Circle) Area() float64 {
+	return math.Pi * math.Pow(c.Radius, 2)
+}
+
+func (c Circle) String() string {
+	return fmt.Sprintf("Circle {Radius: %.2f}", c.Radius)
+}
+
+type Square struct {
+	Width  float64
+	Height float64
+}
+
+func (s Square) Area() float64 {
+	return s.Width * s.Height
+}
+
+func (s Square) String() string {
+	return fmt.Sprintf("Square {Width: %.2f, Height: %.2f}", s.Width, s.Height)
+}
+
+type Sizer interface {
+	Area() float64
+}
+
+type Shaper interface {
+	Sizer
+	fmt.Stringer
+}
+
+func main() {
+	c := Circle{Radius: 10}
+	PrintArea(c)
+
+	s := Square{Height: 10, Width: 5}
+	PrintArea(s)
+
+	l := Less(c, s)
+	fmt.Printf("%v is the smallest\n", l)
+
+}
+
+func Less(s1, s2 Sizer) Sizer {
+	if s1.Area() < s2.Area() {
+		return s1
+	}
+	return s2
+}
+
+func PrintArea(s Shaper) {
+	fmt.Printf("area of %s is %.2f\n", s.String(), s.Area())
+}