Playing with Strings
- by HARSHITH
Given a string and a non-empty word string, return a string made of each char just
before and just after every appearance of the word in the string. Ignore cases where there
is no char before or after the word, and a char may be included twice if it is between two
words.
wordEnds("abcXY123XYijk", "XY") ? "c13i"
wordEnds("XY123XY", "XY") ? "13"
wordEnds("XY1XY", "XY") ? "11"