Update README.md

Author: anujvaghani0

README.md

@@ -14,9 +14,9 @@
 
 #### [BSTs](java_datastructures_algorithms/bst) | [Heap](java_datastructures_algorithms/heap) | [Hashing](java_datastructures_algorithms/hashing) 
 
-#### [Tree Traversal](java_datastructures_algorithms/tree_traversal) | [Graph Traversal](java_datastructures_algorithms/graph_traversal)
+#### [Tree Traversal](https://github.com/anujvaghani0/DSA-Java/tree/master/src/Tree) | [Graph Traversal](https://github.com/anujvaghani0/DSA-Java/tree/master/src/Graph)
 
-#### [Graph Algorithms](https://github.com/anujvaghani0/DSA-Java/tree/master/src/GreedyAlgorithm) | [Sliding Window Algorithm](https://github.com/anujvaghani0/DSA-Java/tree/master/src/SlidingWindow)
+#### [Greedy Algorithms](https://github.com/anujvaghani0/DSA-Java/tree/master/src/GreedyAlgorithm) | [Sliding Window Algorithm](https://github.com/anujvaghani0/DSA-Java/tree/master/src/SlidingWindow)
 
 #### [Dynamic Programming](https://github.com/anujvaghani0/DSA-Java/tree/master/src/DynamicProgramming)
 <br>