In this homework, we will be adding transfer, transfer_from, burn and burn_from functions to our simple token smart contract that we have developed in previous lessons.

Steps

Make sure that all functions must be added to the contract.rs file.

• Complete the transfer function
• Transfer amount of tokens from from address to to address.
• Check if there is sufficient balance during the transfer.
• Complete the transfer_from function
• Transfer amount of tokens from from address to to address.
• This operation should check if the from address has given permission to the to address to make the transfer.
• Complete the burn function
• Burn amount of tokens from from address.
• Check if there is sufficient balance during the burn operation.
• Complete the burn_from function
• Burn amount of tokens from from address to to address.
• This operation should check if the from address has given permission to the to address to burn the tokens.