Add String Manipulation tutorial under Learn the Basics for Java #836
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This pull request adds a new tutorial under the "Learn the Basics" section for Java, focused on string manipulation.
The tutorial introduces common string operations such as concatenation, character access, searching substrings, substring extraction, and transformations (e.g. trim, toUpperCase). It includes a hands-on exercise that requires the user to manually reverse a string without using
StringBuilder.reverse()
.The tutorial follows the required structure:
A link to the tutorial has also been added to the relevant
Welcome.md
file.This should help users deepen their understanding of how to work with strings in Java from an early stage in the learning path.