get_country_info_jp: Get Key Country Information About Japan from the REST Countries API
Description
Retrieves selected, essential information about Japan using the REST Countries API.
The function returns a tibble with core details such as population, area, capital, region,
and official language(s).
A tibble with the following 8 columns, or NULL if the API is unavailable:
name_common: Common name of the country.
name_official: Official name of the country.
region: Geographical region.
subregion: Subregion within the continent.
capital: Capital city.
area: Area in square kilometers.
population: Population of the country.
languages: Languages spoken in the country, as a comma-separated string.
Details
The function sends a GET request to the REST Countries API. If the API returns data for Japan,
the function extracts and returns selected fields as a tibble. If the request fails or
Japan is not found, it returns NULL and prints an informative message.