Improve Banking smart contract by adding and improving some functions.

[rohitroy-github]

Is your feature request related to a problem? Please describe.

No, it's not related to any specific problem.

Describe the solution you'd like

I want to add all the basic functionalities available in a banking system that aren't present in the current contract.

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

I want to make this contribution in accordance to Hacktoberfest 2023

[github-actions]

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