String Repeating
Write a function named repeatString that takes two parameters: str (a string) and num (a number). The function should return a new string that repeats the original string str the specified number of times num.
Example 1
Input: repeatString("abc", 3);
Output: "abcabcabc"
Example 2
Input: repeatString("hello", 2);
Output: "hellohello"
Example 3
Input: repeatString("!", 5);
Output: "!!!!!"
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