fix(guide): simplify directory structure

guide/english/javascript/return-statements/index.md

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+---
+title: Return Statement
+---
+## Introduction
+
+When a **return** statement is called in a function, the execution of this function is stopped. If specified, a given value is returned to the function caller. If the expression is omitted, `undefined` is returned instead.
+
+```js
+    return expression;
+```
+
+Functions can return:
+* Primitive values (string, number, boolean, etc.)
+* Object types (arrays, objects, functions, etc.)
+
+Never return something on a new line without using parentheses. This is a JavaScript quirk and the result will be undefined. Try to always use parentheses when returning something on multiple lines.
+
+```javascript
+function foo() {
+    return 
+      1;
+}
+
+function boo() {
+    return (
+      1
+    );
+}
+
+foo(); --> undefined
+boo(); --> 1
+```
+
+## Examples
+
+The following function returns the square of its argument, **x**, where **x** is a number.
+
+```js
+    function square(x) {
+       return x * x;
+    }
+```
+![:rocket:](//forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=2 ":rocket:") <a href='https://repl.it/C7VT/0' target='_blank' rel='nofollow'>Run Code</a>
+
+The following function returns the product of its arguments, **arg1** and **arg2**.
+
+```js
+    function myfunction(arg1, arg2){
+       var r;
+       r = arg1 * arg2;
+       return(r);
+    }
+```
+
+![:rocket:](//forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=2 ":rocket:") <a href='https://repl.it/C7VU/0' target='_blank' rel='nofollow'>Run Code</a>
+
+When a function `return`s a value, the value can be assigned to a variable using the assigment operator (`=`). In the example below, the function returns the square of the argument. When the function resolves or ends, its value is the `return`ed value. The value is then assigned to the variable `squared2`.
+
+```javascript
+    function square(x) {
+        return x * x;
+    }
+    
+    let squared2 = square(2); // 4
+```
+
+If there is no explicit return statement, meaning the function is missing the `return` keyword, the function automatically returns `undefined`. In the following example, the `square` function is missing the `return` keyword. When the result of calling the function is assigned to a variable, the variable has a value of `undefined`.
+
+```javascript
+    function square(x) {
+        let y = x * x;
+    }
+    
+    let squared2 = square(2); // undefined
+```
+
+![:rocket:](//forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=2 ":rocket:") <a href='https://repl.it/M8BE' target='_blank' rel='nofollow'>Run Code</a>
+
+#### More Information:
+
+<a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/return' target='_blank' rel='nofollow'>MDN link</a>
+
+<a href='https://msdn.microsoft.com/en-us/library/22a685h9.aspx' target='_blank' rel='nofollow'>MSDN link</a>