Given a non-empty string and an int N, return the string made starting with char 0, and then every Nth char of the string. So if N is 3, use char 0, 3, 6, … and so on. N is 1 or more.

everyNth(“Miracle”, 2) ? “Mrce”
everyNth(“abcdefg”, 2) ? “aceg”
everyNth(“abcdefg”, 3) ? “adg”

public String everyNth(String str, int n) {
//char c[]=str.toCharArray();
String str1="";
for(int i=0;i<str.length();i++)
{ if(i%n ==0)
return str1;

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