How can I put the signature into the data file.

Hi all,
I want to put the signature into the data file, mean the data file will be on the top and the signature will be at the buttom.how can i do that?
Thanks.
example:-
dataFile.txt
Name=...
Address=...
Signature=6A07C70E....123FEAB(Hex)

Thanks for your reply.
First, i have a keypair (public key and private key).
I use the private key to initialize the Signature and
use the Signature to sign a data file ( dataFile.txt) .
So when i need to comfirm the data file not being modify
I have to verify the data file with the Signature and the public key.
I hardcoded the public key in my program so my client (receiver of data)
need only the Signature file and the data file (2 files).
So how can i combine the Signature file and the data file into 1 file?

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