Update readme

Author: th92rodr

README.md

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 Coding challenges and technical interview preps
 
+## Google Interview Prep
 
-### Google Interview Prep
+- Find the middle element of a linked list
 
-#### - Find the middle element of a linked list
+- Two sum problem</br>
 
-#### - Two sum problem</br>
 Determine if two numbers in an array sum to a specific value
 
-#### - Print all subsets (power set) of a given set</br>
+- Print all subsets (power set) of a given set</br>
+
 Printing all possible subsets of a given set
 
-#### - Subset sum problem
+- Subset sum problem
 
-#### - Determine if a tree is a subtree of a larger binary tree
+- Determine if a tree is a subtree of a larger binary tree
 
-#### - Generate all balanced bracket combinations
+- Generate all balanced bracket combinations
 
-#### - Find all string combinations of only 0, 1 and ?
+- Find all string combinations of only 0, 1 and ?
 
-#### - Insert an interval into a list of sorted disjoint intervals
+- Insert an interval into a list of sorted disjoint intervals
 
-#### - Implement a queue using two stacks
+- Implement a queue using two stacks
 
-#### - Counting steps using recursion
+- Counting steps using recursion
 
-#### - Stock maximum profit
+- Stock maximum profit
 
-#### - Quickly calculate the cube root of a number
+- Quickly calculate the cube root of a number