/** * Merges two strings together, using alternating characters from each, * except that runs of the same character are kept together. For example, *

*
• mergePreservingRuns("abcde", "xyz") returns "axbyczde" *
• mergePreservingRuns("abbbbcde", "xyzzz") returns "axbbbbyczzzde" *

* Either or both of the strings may be empty. If the first string * is nonempty, its first character will be first in the returned string. * @param t * first string * @param s * second string * @return * string obtained by merging characters from t and s, preserving runs */ public static String mergePreservingRuns(String t, String s) { // TODO return null; }