Compilation Issue Due to Method Definitions in Both '.cpp' and '.hpp' Files in 'greg_weekday' Class

[Vignesh-Murugappan]

The methods in the "greg_weekday" class are defined in both the .cpp and .hpp files, which causes a compilation issue.

For example, the as_short_string method is defined in greg_weekday.cpp as follows:

//! Return a 3-digit English string of the day of the week (e.g., Sun)
const char* greg_weekday::as_short_string() const 
{
    return short_weekday_names[value_];
}

However, the same method is also defined in the .hpp file as:

//! Return a 3-digit English string of the day of the week (e.g., Sun)
const char* as_short_string() const
{
    static const char* const short_weekday_names[] 
        = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};

    return short_weekday_names[value_];
}