twoChar.java

/*
Given a string and an index, return a string length 2 starting at the given index. If the index is too big or too small to define a string length 2, use the first 2 chars. The string length will be at least 2.

twoChar("java", 0) → "ja"
twoChar("java", 2) → "va"
twoChar("java", 3) → "ja"
*/
public String twoChar(String str, int index) {
  if(index < 1) {
    return str.substring(0,2);
  }
  if(index + 2 <= str.length()) {
  return str.substring(index,index+2);
  }
  if(index + 2 > str.length()) {
    index = 0;
    return str.substring(index, index+2);
  }
  return str;
}