Update README.md

Author: dtuyenle

README.md

@@ -25,7 +25,7 @@
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 Technical Chellenge
-Initially I used recursion and this was the biggest mistake since js doesn't support tail optimization. When the data becomes too big with many nested level of data. The browser actually will crash.
+Initially I used recursion and this was the biggest mistake since js doesnt support tail optimization. When the data becomes too big with many nested level of data. The browser actually will crash.
 
 Solved by:
 -> Instead of using recursion, use iteration.
@@ -34,6 +34,3 @@ Solved by:
 
 I know this is against data mutation best practice but for performance we must mutate all the way.
 
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