Re: Help me to recover 33.54 BTC from a corrupt wallet.dat, I'll pay you a Reward!
I have that same type of file (a little different/but same just older) and have been reading about going through the source code to retrieve the "redeem script" or the "derivation method" but first I wanted to ask .. what is that src/wallet/walletdb.cpp specifically? as I don't see any strings but I do see key all over..
It sounds like you have become very confused... I'm not sure what you hope to find by looking in the Bitcoin Core source... A wallet.dat is simply a "BerkeleyDB" database format file. You are NOT going to find any "redeem script" or "derivation method" for a wallet file that is as old as you claim by looking at C++ source code for Bitcoin Core. 
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my python said "cannot import name 'generator_secp256k1' from 'pycoin.ecdsa" when trying to install bitwalletrecover.
This means that you have not installed the appropriate Python library... specifically, this one: https://github.com/richardkiss/pycoinIn any case, I would suggest that you take a few steps backwards as you seem to be heading down the wrong path. Have you attempted to dump the contents of your wallet.dat using something like PyWallet (https://bitcointalk.org/index.php?topic=34028.0)?
One last tip... make a couple of copies of your wallet.dat and work on the copies, don't try and run scripts etc on the original version of your wallet.dat file.