This canisters shows how to utilize canister HTTPs outcalls to make a call to api.coinbase.com to get the current exchange rates for BTC against KES and USD
This is the main function that's making the HTTPs call.
It first defines the URL for Coinbase API endpoint that provides exchange rates for BTC
It then sets up the HTTP headers for the request. The Host and User-Agent headers are set
It then sends teh HTTP request using the http_request function from the ic_cdk::api::management_canister::http_request module. The function is await because it is asyncronous
The other section is for handling the HTTP response. If the request is succesfull Ok(), it parses the response body from bytes to a String, then parses the JSON string into a serde_json::Value. It then accesses the "KES" and "USD" fields from the parsed JSON and returns a formatted string containing the exchange rates. If the request fails Err, it returns a string describing the error.
This function takes in the HTTP response as input and returns the transformed data.
