panic: runtime error: index out of range [5] with length 3

goroutine 1 [running]:
main.pick(...)
	/home/konkan/development/showcase/errexplain/examples/goapp/main.go:6
main.main()
	/home/konkan/development/showcase/errexplain/examples/goapp/main.go:11 +0x18
exit status 2
