Given some positive integers, I wish to print the integers such that all take up the same width by adding a minimum number of leading zeroes. No leading zeroes shall be added to the largest integer.
For example, given `1, 23, 2, 17, 102`, I wish to print out these numbers as follows:
```python
001
023
002
017
102
```
Write a function `print_nums(n1, n2, n3, ...)` that takes a variable number of arguments and returns the string to be printed out.
def print_nums(*arr):
    if not arr: return ''
    ln = len(str(max(arr)))
    return '\n'.join(str(c).zfill(ln) for c in arr)
def print_nums(*arr):
    if not arr: return ''
    ln = len(str(max(arr)))
    return '\n'.join(str(c).zfill(ln) for c in arr)