Write a function named repeat that accepts an array ofStrings and an integer k as parameters and that replaces each element with k copies
of that element.
For example, if an array stores the values ["how", "are", "you?"] before the function is called and k is 4, it should store the values ["how", "how", "how", "how", "are", "are", "are", "are", "you?", "you?", "you?", "you?"] after the function finishes executing.
If k is 0 or negative, the array should be empty after the call. You may assume that the array passed is non-null.
