##Introduction
##Your task is to convert a number into a string that contains raindrop sounds corresponding to certain potential factors. A factor is a number that evenly divides into another number, leaving no remainder. The simplest way to test if a one number is a factor of another is to use the modulo operation.
##The rules of raindrops are that if a given number:
##
    ## has 3 as a factor, add 'Pling' to the result.
    ## has 5 as a factor, add 'Plang' to the result.
    ## as 7 as a factor, add 'Plong' to the result.
    ## does not have any of 3, 5, or 7 as a factor, the result should be the digits of the number.
