A few code improvements, turns out I didn't need an interface after all.

* Created a proper struct for the weather
* Created methods to the weather struct to handle weather requests

main.go

@@ -293,18 +293,19 @@ func generateURL(domain string, v2 bool, location string, lang string, format st
 	return link, headers
 }
 
-// TODO:
-//   * Create interfaces to print and save and migrate code to them
-//
-// Figure out if we need to print or download a PNG image
-// and call the server accordingly.
-func getWheather(url string, headers map[string]string, download bool) {
+type weather struct {
+	url string
+}
 
-	req, err := http.NewRequest("GET", url, nil)
+func (w weather) newRequest(headers map[string]string) *http.Request {
+	req, err := http.NewRequest("GET", w.url, nil)
 	if err != nil {
 		log.Fatal("Error reading request. ", err)
 	}
+	return w.formatHeader(req, headers)
+}
 
+func (w weather) formatHeader(req *http.Request, headers map[string]string) *http.Request {
 	req.Header.Set("Content-Type", "text/plain; charset=utf-8")
 	// I had to read the wttr.in code to figure this one out.
 	// It wasn't Golang, it was 2 wasted hours that I won't be getting back.
@@ -313,7 +314,10 @@ func getWheather(url string, headers map[string]string, download bool) {
 	for key, value := range headers {
 		req.Header.Add(key, value)
 	}
+	return req
+}
 
+func (w weather) get(req *http.Request, download bool) {
 	client := &http.Client{}
 	client.Jar = nil
 
@@ -324,26 +328,41 @@ func getWheather(url string, headers map[string]string, download bool) {
 	defer resp.Body.Close()
 
 	if download {
-		splitURL := strings.Split(url, "/")
-		filename := splitURL[len(splitURL)-1]
-
-		f, err := os.Create(filename)
-		if err != nil {
-			return
-		}
-		defer f.Close()
-
-		_, err = io.Copy(f, resp.Body)
+		w.download(resp)
 	} else {
-
-		body, err := ioutil.ReadAll(resp.Body)
-		if err != nil {
-			log.Fatal("Error reading body. ", err)
-		}
-		fmt.Printf("%s\n", body)
+		w.print(resp)
 	}
 }
 
+func (w weather) print(resp *http.Response) {
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		log.Fatal("Error reading body. ", err)
+	}
+	fmt.Printf("%s\n", body)
+}
+
+func (w weather) download(resp *http.Response) {
+	splitURL := strings.Split(w.url, "/")
+	filename := splitURL[len(splitURL)-1]
+
+	f, err := os.Create(filename)
+	if err != nil {
+		return
+	}
+	defer f.Close()
+
+	_, err = io.Copy(f, resp.Body)
+}
+
+// Wraper function around the weather struct
+func getWheather(url string, headers map[string]string, download bool) {
+
+	w := weather{url}
+	req := w.newRequest(headers)
+	w.get(req, download)
+}
+
 // This is the main function that glues everything together.
 func main() {
 	var params cmdParams = cmdParams{}