If i will be given a chance to do a project with cryptocurrency then i will be making an all in one digital wallet for all crypto that includes bitcoin and all altcoins using same wallet address...
A wallet which does create the same
address for each crypto currency is not possible.
(Almost) each cryptocurrency does have its own address format.
What you might be refering to is a wallet which holds private keys for multiple cryptos derived from one seed. This is possible. And it does exist.
Exodus is such a wallet.
But note that quite a few people have connection issues when using exodus. It also just had a vulnerability discovered which allowed an attacker to dump the private keys out of the RAM once the wallet was opened. I am not sure about which versions are affected.
The ledger nano s does also support multiple cryptocurrencies. And in addition to that the private keys (and the seed generation) are secured by a secure element and a 2-FA through the buttons/screen.
Once they release their native application, you will be able to
monitor all your holdings in a dashboard.