Exercise: Repetition and Concatenation
Convert integers to strings and create multiple instances of these string representations.
Problem statement
In this exercise, you are required to implement the rep_cat function. You are given two integers, x and y, as arguments. Convert them into strings. The string representation of x should be repeated x times, and the string representation of y should be repeated y times. Finally, concatenate the string resulting from y to the string resulting from x, and return the resulting string.