Algorithm

We have a lot of is_prime (or similar) functions: https://github.com/TheAlgorithms/Python/search?p=4&q=is_prime, https://github.com/TheAlgorithms/Python/search?q=isPrime, data_structures/hashing/number_theory/prime_numbers, etc. Shall we use one common function for that exactly identical

Describe the bug
Variable type writing error

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Java/src/main/java/com/thealgorithms/datastructures/trees'
2. Click on 'AVLSimple'
3. Scroll down to 'Line 85'
4. See error

Expected behavior
Modify variable “Strings” to “String”

Screenshots
If applicable, add screenshots to help explain your problem.
![image](h

What about create a design pattern directory with the most popular design patterns examples?
We can create some rules like: have to be an explanation about the design pattern, the structure and one real world example.
The directory can be:

(folder) Design Patterns
-- (folder) Abstract Factory
-- -- AbstractFactory.js
-- -- AbstractFactoryTest.js
-- -- REAME.md

I can send some :

You may use this guide to make quality contributions at Hacktoberfest 2020: Hacktoberfest 2020 guide

To begin contributing, you shall get a quick overview of how Cosmos is used today. Cosmos is one of the most extensive code database and is used as:

• A datastore for various projects (such as [Quark](https://github.com/OpenGenus/

🚀 Feature Proposal

Adding leading zero in the question number will be an awesome feature for file explorer to sort files by the name.