Write a function named copy_arr(source, target, length) to copy the
contents of an array-of-double to another array.
Write another function named sort(array, length) to sort the array passed
by parameter in descending order.
Write a main() function that initializes the array-of-double and then call
copy_arr() to make the copy, and show all the element-values of the copied
array . then call the sort() function , and show all the element-values of the
sorted array.
Here is an example main():
double source[5] = {1.1, 2.2, 3.3., 4.4, 5.5};
double target [5];
copy_arr(source, target, 5);
display_array(target);
sort(target);
display_array(source);//for comparing
display_array(target);