Add solution directories for exercises

03_reverseString/solution/reverseString-solution.js

@@ -0,0 +1,5 @@
+const reverseString = function (string) {
+    return string.split('').reverse().join('');
+};
+
+module.exports = reverseString;

03_reverseString/solution/reverseString-solution.spec.js

@@ -0,0 +1,18 @@
+const reverseString = require('./reverseString-solution');
+
+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('');
+    });
+});