Given two strings,write a method to decide if one is a permutation of the other.

Example 1:

Input: s1 = "abc", s2 = "bca"

Output: true

Example 2:

Input: s1 = "abc", s2 = "bad"

Output: false

Note:

1. 0 <= len(s1) <= 100
2. 0 <= len(s2) <= 100