Function call_api_endpoint 

pub async fn call_api_endpoint<'a, R: DeserializeOwned>(
    api_key: &str,
    endpoint: APIEndpoint,
    unit: Unit,
    params: Vec<Param<'a>>,
    additional_params: Option<String>,
) -> Result<R, Error>

Constructs a URL for API request, sends the request, and returns the deserialzied response.

Input

• api_key: CoinDesk API key
• endpoint: Enum that represents the CoinDesk API endpoint for function to send the request to
• unit: Unit for data to be binned by (e.g., Day, Hour)
• params: List of parameters expected by the CoinDesk API endpoint
• additional_params: Additional parameters to add to the request