Create a function that takes a number num and returns the first 10 multiples of num with 1 added to it, separated by commas.
n_tables_plus_one(7) ➞ "8,15,22,29,36,43,50,57,64,71"
n_tables_plus_one(1) ➞ "2,3,4,5,6,7,8,9,10,11"
n_tables_plus_one(3) ➞ "4,7,10,13,16,19,22,25,28,31"
There is no comma after the last number.