The contract is basically shows different error handling implementation i.e require, assert, & revert
The deposit function allows users to deposit a value into the contract. It incorporates require to ensure that the deposited amount is greater than 1 and updates balance saved in state
The withdraw function allows users to withdraw a value from the contract. It uses assert to check that the withdrawal amount is less than or equal to the balance in the contract after which the balance state is updated
The function utilizes a revert condition if the parameter passed in is zero. if the condition amount == 0 is met, the transaction reverts and the remaining gas is refunded, else the function call goes through