Your task in order to complete this Kata is to write a function which formats a duration, given as a number of seconds, in a human-friendly way.
The function must accept a non-negative integer. If it is zero, it just returns "now". Otherwise,
the duration is expressed as a combination of years, days, hours, minutes and seconds.
It is much easier to understand with an example:
* For seconds = 62, your function should return
"1 minute and 2 seconds"
* For seconds = 3662, your function should return
"1 hour, 1 minute and 2 seconds"
For the purpose of this Kata, a year is 365 days and a day is 24 hours.
Note that spaces are important.
The resulting expression is made of components like 4 seconds, 1 year, etc. In general, a
positive integer and one of the valid units of time, separated by a space. The unit of time is used
in plural if the integer is greater than 1.
The components are separated by a comma and a space (", "). Except the last component, which is
separated by " and ", just like it would be written in English.
A more significant units of time will occur before than the least significant one.
Therefore, 1 second and 1 year is not correct, but 1 year and 1 second is.
Different components have different unit of times. So there is not repeated units like
in 5 seconds and 1 second.
A component will not appear at all if its value happens to be zero. Hence, 1 minute and 0 seconds
is not valid, but it should be just 1 minute.
A unit of time must be used "as much as possible". It means that the function should not
return 61 seconds, but 1 minute and 1 second instead. Formally, the duration specified by of a
component must not be greater than any valid more significant unit of time.