Given below is a function changeCityName
that takes two parameters.
The first is the name of a city, and
the second is a callback
function that makes changes
to the name of the city.
Run this function once and
provide it two values. First,
provide it a value Tokyo. Then,
as the next argument, provide it
an anonymous function that returns
the value TOKYO. Save the returned
value in a variable and then log it to the
console.