Added Link Shortener Tool

L/link-shortner/Readme.md

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+## link shortener in Python
+URL shortener using the hashlib library to generate short URLs based on the MD5 hash of the original URL.
+<br>
+
+## Note
+URLShortener is a class that generates short URLs from original URLs and maintains a mapping between them. It uses the MD5 hash of the original URL to create a short key.

L/link-shortner/link_shortner.py

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+import hashlib
+
+class URLShortener:
+    def __init__(self):
+        self.url_mapping = {}
+        self.base_url = "https://short.url/"
+
+    def shorten_url(self, original_url):
+        # Generate a unique identifier for the URL using MD5 hash
+        md5_hash = hashlib.md5(original_url.encode()).hexdigest()
+
+        # Take the first 8 characters of the hash as the short URL
+        short_url = md5_hash[:8]
+
+        # Store the mapping between the short URL and the original URL
+        self.url_mapping[short_url] = original_url
+        return self.base_url + short_url
+
+    def expand_url(self, short_url):
+        # Extract short key from URL
+        short_key = short_url.split("/")[-1]
+
+        # Look up original URL from mapping
+        original_url = self.url_mapping.get(short_key, None)
+        return original_url
+
+# Usage
+if __name__ == "__main__":
+    url_shortener = URLShortener()
+    original_url = "https://www.example.com"
+    short_url = url_shortener.shorten_url(original_url)
+    print(f"Short URL: {short_url}")
+    expanded_url = url_shortener.expand_url(short_url)
+    print(f"Expanded URL: {expanded_url}")
+