Given a string S. The task is to print all permutations of a given string. You don't need to read input or print anything. Your task is to complete the function find_permutaion() which takes the ...

// Given two strings s1 and s2, write a function to return true if s2 contains the permutation of s1. In other words, one of the first string's permutations is the substring of the second string.