Created by Mark NAGI, 2023 All right reserved

• checkUpkeep: Checks whether the contract should perform upkeep and returns a boolean value indicating whether or not to do so.
• performUpkeep: Performs the upkeep by updating all NFT metadata and retrieving the temperature for one of the five eligible cities in an iterative approach.
• buildMetadata: Builds the metadata for an NFT by returning Source64 code that can be converted back to JSON format.
• update_nfts: Updates the temperature data for the NFTs.
• requestTempData: Requests temperature data from the Weather API.
• fulfill: Assigns the temperature variable to the return value of the API request.
• mint4me: Mints an NFT for the specified city and tier.
• giveEquity: Gives fake ETH to the message sender.
• verifyContractDuration: Verifies that the contract is still valid.
• verifyThreshold: Verifies that the temperature threshold has been reached.
• giveClaim: Checks if the temperature threshold conditions are met, and pays the message sender the claim amount.