Order exercise folders

Ordered the exercise folders by placing their numbers in their folder name

03 reverseString/reverseString.spec.js

@@ -0,0 +1,18 @@
+const reverseString = require('./reverseString')
+
+describe('reverseString', () => {
+  test('reverses single word', () => {
+    expect(reverseString('hello')).toEqual('olleh');
+  });
+
+  test.skip('reverses multiple words', () => {
+    expect(reverseString('hello there')).toEqual('ereht olleh')
+  })
+
+  test.skip('works with numbers and punctuation', () => {
+    expect(reverseString('123! abc!')).toEqual('!cba !321')
+  })
+  test.skip('works with blank strings', () => {
+    expect(reverseString('')).toEqual('')
+  })
+});