ParseHashV validates the length and encoding of the string and throws
an informative RPC error on failure, which is as good or better than
these alternative calls.
Note I switched ParseHashV to check string length first, because
IsHex tests that the length is even, and an error like:
"must be of length 64 (not 63, for X)" is much more informative than
"must be hexadecimal string (not X)"
Changing logs to debug level and format of statment to j == ...
Updating debug statements to include comments when checking for iteration level of i and j
Removing comments above log prints in Part 3
Removing unwanted file
Added log prints in loops in p2p_sendheaders