Write a public static method that takes as parameters a string and an integer d, and returns the encoding of the string with the integer. The encoding is obtained by substituting each character c in the string with the character that has the code equal to the code of c incremented by d.
Example: "ciao" with d= 3 becomes "fldr"
public static String encode(String s, int d) { String resStr; char c; int ci; resStr = ""; for (int i = 0; i < s.length(); i++) { c = s.charAt(i); ci = (int)c; ci += d; c = (char)ci; resStr = resStr + c; } return resStr; }