Move from learn-go-with-tests

Signed-off-by: Oliver Davies <oliver@oliverdavies.uk>

learn-go-with-tests/hello.go

@@ -0,0 +1,29 @@
+package main
+
+import "fmt"
+
+const englishHelloPrefix = "Hello, "
+const welsh = "Welsh"
+const welshHelloPrefix = "Helo, "
+
+func Hello(name string, language string) string {
+	if name == "" {
+		name = "World"
+	}
+
+	return greetingPrefix(language) + name
+}
+
+func greetingPrefix(language string) (prefix string) {
+	prefix = englishHelloPrefix
+
+	if language == welsh {
+		prefix = welshHelloPrefix
+	}
+
+	return
+}
+
+func main() {
+	fmt.Println(Hello("Oliver", ""))
+}