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Add MinHeap class implementation in Java #319
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This PR adds a generic MinHeap implementation in Java to the repository. The class includes the following features:
Insertion (insert(T data)): Adds a new element while maintaining the min-heap property.
Extraction of minimum (extractMin()): Removes and returns the smallest element.
Peek (peek()): Returns the minimum element without removing it.
Check if empty (isEmpty()): Returns true if the heap is empty.
Size (size()): Returns the number of elements in the heap.
Height (height()): Returns the height of the heap.
Print heap (printHeap()): Prints elements in level order for debugging purposes.