little change

Assignment2/README.md

@@ -18,7 +18,7 @@ We have provided incomplete code for implementing some crypto-primitives and dat
 
 You don't need to write anything in the above two files.
 
-3. _src/crypto/merkle.rs_ - function declaration for __create()__ and __root()__ of Merkle tree
+3. _src/crypto/merkle.rs_ - struct defition of **MerkleTree** struct and the related function declaration
 4. _src/transaction.rs_ - struct defition of **Transaction** struct and function declaration for __sign()__ and __verify()__ .
 
 You will write your code in the above two files.