问题描述:
Write a function to round the given number to the nearest multiple of a specific number.

测试用例:
['assert round_num(4722,10)==4720', 'assert round_num(1111,5)==1110', 'assert round_num(219,2)==218']

生成的代码:
def round_num(number, multiple):
    return round(number / multiple) * multiple

# Test cases
assert round_num(4722,10)==4720
assert round_num(1111,5)==1110
assert round_num(219,2)==218