added other units

Unit 4/Day 2/index.html

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+<!doctype html>
+<html>
+<head>
+<title>Unit 4 Day 2</title>
+<link href="style.css" rel="stylesheet" type="text/css" />
+</head>
+<body>
+    <h1>Count "s" and "S" characters</h1>
+    <label for="input1">Input:</label>
+    <input type="text" id="input1"></input>
+    <button onclick="program1(document.getElementById('input1').value)">Submit</button>
+    <p>Output: <p id="out1"></p></p>
+<hr>
+    <h1>Capitalize every odd number letter and lowercase every even number letter</h1>
+    <label for="input2">Input:</label>
+    <input type="text" id="input2"></input>
+    <button onclick="program2(document.getElementById('input2').value)">Submit</button>
+    <p>Output: <p id="out2"></p></p>
+    <script src="script.js"></script>
+</body>
+</html>