diff --git a/03. Data Structures/Queues/LEARN b/03. Data Structures/Queues/LEARN
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/03. Data Structures/Queues/LEARN	
@@ -0,0 +1 @@
+
diff --git a/07. Functional Programming/enumerate.py b/07. Functional Programming/enumerate.py
new file mode 100644
index 0000000..eef1904
--- /dev/null
+++ b/07. Functional Programming/enumerate.py	
@@ -0,0 +1,4 @@
+fruits = ['apple', 'banana', 'cherry', 'grape']
+
+for index, fruit in enumerate(fruits, 1):
+	print(index, fruit)
diff --git a/14. Questions/leetcode 28 - index of first occurrence.py b/14. Questions/leetcode 28 - index of first occurrence.py
new file mode 100644
index 0000000..e059e17
--- /dev/null
+++ b/14. Questions/leetcode 28 - index of first occurrence.py	
@@ -0,0 +1,26 @@
+# find the index of the first occurrence of a string | leetcode 28 | https://leetcode.com/problems/find-the-index-of-the-first-occurrence-in-a-string/
+# sliding window to match each character of the haystack with the needle; no slices.
+
+class Solution:
+    def strStr(self, haystack: str, needle: str) -> int:
+        # ----- using regex -----
+        # if needle == '':
+        #     return 0
+        
+        # import re
+        # match = re.search(needle, haystack)
+        # return match.start() if match else -1
+
+        # ----- using sliding windows -----
+        ptrL, ptrR = 0, 0
+        N_needle, N_haystack = len(needle), len(haystack)
+        while ptrR < N_haystack:
+            if haystack[ptrR] == needle[ptrR - ptrL]:
+                ptrR += 1
+                if ptrR - ptrL > N_needle - 1:
+                    return ptrL
+            else:
+                ptrR = ptrL + 1
+                ptrL += 1
+        
+        return -1
diff --git a/14. Questions/leetcode 443 - string compression.py b/14. Questions/leetcode 443 - string compression.py
new file mode 100644
index 0000000..098546c
--- /dev/null
+++ b/14. Questions/leetcode 443 - string compression.py	
@@ -0,0 +1,22 @@
+# string compression | leetcode 443 | https://leetcode.com/problems/string-compression/
+# sliding window to keep track of a char's occurence
+
+class Solution:
+    def compress(self, chars: list[str]) -> int:
+        ptrL, ptrR = 0, 0
+        total = 0
+        chars += " "
+
+        while ptrR < len(chars):
+            if chars[ptrL] != chars[ptrR]:
+                chars[total] = chars[ptrL]
+                total += 1
+                group = ptrR - ptrL
+                if group > 1:
+                    for x in str(group):
+                        chars[total] = x
+                        total += 1
+                ptrL = ptrR
+            ptrR += 1
+            
+        return total
diff --git a/loggerMiddleware.js b/loggerMiddleware.js
new file mode 100644
index 0000000..25925e8
--- /dev/null
+++ b/loggerMiddleware.js
@@ -0,0 +1,29 @@
+const express = require('express');
+const app = express();
+
+// Middleware function to log requests
+app.use((req, res, next) => {
+  console.log(`Received a ${req.method} request to ${req.url}`);
+  next(); // Call next() to move to the next middleware or route handler
+});
+
+// Middleware function to check if the request contains a specific header
+app.use((req, res, next) => {
+  if (req.headers.authorization) {
+    console.log('Authorization header present');
+  } else {
+    console.log('Authorization header not present');
+  }
+  next();
+});
+
+// Route handler
+app.get('/', (req, res) => {
+  res.send('Hello, World!');
+});
+
+// Starting the server
+const PORT = process.env.PORT || 3000;
+app.listen(PORT, () => {
+  console.log(`Server is running on port ${PORT}`);
+});
diff --git a/server.js b/server.js
new file mode 100644
index 0000000..ec24f31
--- /dev/null
+++ b/server.js
@@ -0,0 +1,32 @@
+// Import required modules
+const express = require('express');
+
+// Create an Express application
+const app = express();
+
+// Middleware function to log requests
+app.use((req, res, next) => {
+  console.log(`Received a ${req.method} request to ${req.url}`);
+  next(); // Call next() to move to the next middleware or route handler
+});
+
+// Middleware function to check if the request contains a specific header
+app.use((req, res, next) => {
+  if (req.headers.authorization) {
+    console.log('Authorization header present');
+  } else {
+    console.log('Authorization header not present');
+  }
+  next();
+});
+
+// Route handler
+app.get('/', (req, res) => {
+  res.send('Hello, World!');
+});
+
+// Starting the server
+const PORT = process.env.PORT || 3000;
+app.listen(PORT, () => {
+  console.log(`Server is running on port ${PORT}`);
+});