Update Permutation_of_string.cpp div-bargali#605

Update Permutation_of_string.cpp

Author: div-bargali

C++/Algorithms/Backtracking/Permutation_of_string.cpp

@@ -3,7 +3,7 @@ using namespace std;
 
 // Function to find all Permutations of a given string str[i..n-1]
 // containing all distinct characters
-void permutations(string str, int i, int n)
+void permutations(string str, int i, int n,int j, int k )
 {
  // base condition
  if (i == n - 1)