refactor: variables/assignment exercises and questions

06-variables/04-assignment/exercises/04-find-the-rectangle-area/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+// ---------------------------------------------------------
+// EXERCISE: Find the Rectangle's Area
+//
+//  1. Find the length of a rectangle
+//     Its width is  5
+//     Its height is 6
+//
+//  2. Assign the result to the `length` variable
+//
+//  3. Print the `length` variable
+//
+// HINT
+//  Rectangle formula = 2 * (width + height)
+//
+// EXPECTED OUTPUT
+//  22
+// ---------------------------------------------------------
+
+func main() {
+	// DO NOT CHANGE THIS
+
+	// var (
+	// 	length        int
+	// 	width, height = 5, 6
+	// )
+
+	// USE THE VARIABLES ABOVE WHEN CALCULATING YOUR RESULT
+
+	// ADD YOUR CODE BELOW
+}