/* Given two strings, append them together (known as "concatenation") and * return the result. However, if the concatenation creates a double-char, * then omit one of the chars, so "abc" and "cat" yields "abcat". */ public String conCat(String a, String b) { if(a.length() == 0 || b.length() == 0) return a + b; if(a.charAt(a.length() - 1) == b.charAt(0)) return a + b.substring(1); return a + b; }