quick sketch to figure out a general solution the rot_(5+3+8) email address type problem.

rot_(5+3+8)

/*
index  1 2 3 4 5 6 7 8 9 1011121314151617181920212223242526                                         
input  a b c d e f g h i j k l m n o p q r s t u v w x y z
output k l m n o p q r s t u v w x y z a b c d e f g h i j  
*/
void setup() {
  int range = 26;
  int offset = 16;
  for (int indx = 0; indx < range; indx++) {
    int output = (indx + offset) % range;
    println(indx + "%"+ offset + " = " + output);
  }
}


void twoArray(){
// show the super manual way of creating two arrays of 26 letters. One normal and one offset
}

void ifElseWay(){
// show how to do it with an if/else statement
}