Added Common Child HackerRank Solution

Added Common Child HackerRank Solution Tutorial

Author: kanahaiya

README.md

@@ -196,7 +196,8 @@ then you are at the right place. :)
 |         Strings  	      | [Game of Thrones - I](https://www.hackerrank.com/challenges/game-of-thrones/problem)         										| [GameOfThronesI.java](https://github.com/Java-aid/Hackerrank-Solutions/blob/master/HackerRankDashboard/CoreCS/Algorithms/src/main/java/com/javaaid/hackerrank/solutions/algorithms/strings/GameOfThronesI.java)        							     				  |                                                            |
 |         Strings  	      | [Sherlock and the Valid String](https://www.hackerrank.com/challenges/sherlock-and-valid-string/problem)         					| [SherlockAndTheValidString.java](https://github.com/Java-aid/Hackerrank-Solutions/blob/master/HackerRankDashboard/CoreCS/Algorithms/src/main/java/com/javaaid/hackerrank/solutions/algorithms/strings/SherlockAndTheValidString.java)        							  |                                                            |
 |         Strings  	      | [Separate the Numbers](https://www.hackerrank.com/challenges/separate-the-numbers/problem)         						   			| [SeparateTheNumbers.java](https://github.com/Java-aid/Hackerrank-Solutions/blob/master/HackerRankDashboard/CoreCS/Algorithms/src/main/java/com/javaaid/hackerrank/solutions/algorithms/strings/SeparateTheNumbers.java)        							      		  | [Tutorial](https://youtu.be/q9d7MZpuWSE)                   |
-|         Strings  	      | [PalindromeIndex](https://www.hackerrank.com/challenges/palindrome-index/problem)         						   					| [PalindromeIndex.java](https://github.com/Java-aid/Hackerrank-Solutions/blob/master/HackerRankDashboard/CoreCS/Algorithms/src/main/java/com/javaaid/hackerrank/solutions/algorithms/strings/PalindromeIndex.java)        							      		  	  | [Tutorial](https://youtu.be/U_5l038GR5I)                   |
+|         Strings  	      | [PalindromeIndex](https://www.hackerrank.com/challenges/palindrome-index/problem)         						   					| [PalindromeIndex.java](https://github.com/Java-aid/Hackerrank-Solutions/blob/master/HackerRankDashboard/CoreCS/Algorithms/src/main/java/com/javaaid/hackerrank/solutions/algorithms/strings/PalindromeIndex.java)        							      		  	  	  | [Tutorial](https://youtu.be/U_5l038GR5I)                   |
+|         Strings  	      | [Common Child](https://www.hackerrank.com/challenges/common-child/problem)         						   			 				| [CommonChild.java](https://github.com/Java-aid/Hackerrank-Solutions/blob/master/HackerRankDashboard/CoreCS/Algorithms/src/main/java/com/javaaid/hackerrank/solutions/algorithms/strings/CommonChild.java)        							      		  	 			  | [Tutorial](https://youtu.be/ItRZRx8kvwY)                   |
 |   	 Recursion  	  | [Recursive Digit Sum](https://www.hackerrank.com/challenges/recursive-digit-sum/problem)         						   			| [RecursiveDigitSum.java](https://github.com/Java-aid/Hackerrank-Solutions/blob/master/HackerRankDashboard/CoreCS/Algorithms/src/main/java/com/javaaid/hackerrank/solutions/algorithms/recursion/RecursiveDigitSum.java)        							     		  |                                                            |
 |   Dynamic Programming   | [Fibonacci Modified](https://www.hackerrank.com/challenges/fibonacci-modified/problem)         						   				| [FibonacciModified.java](https://github.com/Java-aid/Hackerrank-Solutions/blob/master/HackerRankDashboard/CoreCS/Algorithms/src/main/java/com/javaaid/hackerrank/solutions/algorithms/dynamicprogramming/FibonacciModified.java)        							      |                                                            |
 |   Dynamic Programming   | [The Maximum Subarray](https://www.hackerrank.com/challenges/maxsubarray/problem)         						   					| [TheMaximumSubarray.java](https://github.com/Java-aid/Hackerrank-Solutions/blob/master/HackerRankDashboard/CoreCS/Algorithms/src/main/java/com/javaaid/hackerrank/solutions/algorithms/dynamicprogramming/TheMaximumSubarray.java)        							  |                                                            |
@@ -373,6 +374,7 @@ then you are at the right place. :)
 |:-----------------------------------:|:----------------------------------------------------------------------------------------------------------------------------:|:--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------:|:----------------------------------------------------------:|
 |      Dictionaries and Hashmaps      | [Count Triplets](https://www.hackerrank.com/challenges/count-triplets-1)                                					 | [CountTriplets.java](https://github.com/Java-aid/Hackerrank-Solutions/blob/master/HackerRankDashboard/Interview-Preparation-Kit/src/main/java/com/javaaid/dictionaries/CountTriplets.java)                         	  										   	    | 		[Tutorial](https://youtu.be/tBFZMaWP0W8)		     |
 |      			Search			      | [Triple sum](https://www.hackerrank.com/challenges/triple-sum/problem)                                					     | [TripleSum.java](https://github.com/Java-aid/Hackerrank-Solutions/blob/master/HackerRankDashboard/Interview-Preparation-Kit/src/main/java/com/javaaid/search/TripleSum.java)                         	  										   	  			    | 		[Tutorial](https://youtu.be/pVkHLciuank)		     |
+|      	String Manipulation			  | [Common Child](https://www.hackerrank.com/challenges/triple-sum/problem)                                					 | [CommonChild.java](https://github.com/Java-aid/Hackerrank-Solutions/blob/master/HackerRankDashboard/CoreCS/Algorithms/src/main/java/com/javaaid/hackerrank/solutions/algorithms/strings/CommonChild.java)                         	  								| 		[Tutorial](https://youtu.be/ItRZRx8kvwY)		     |