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/* 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.

public String wordEnds(String str, String word) {

StringBuffer result = new StringBuffer();

int i = 0;

if(str.length() >= word.length() + 1 &&

str.substring(0, word.length()).equals(word)) {

i = word.length() - 1;

result.append(str.charAt(i + 1));

}

while(i < str.length() - word.length()) {

if(str.substring(i + 1, i + 1 + word.length()).equals(word)) {

result.append(str.charAt(i));

i = i + word.length();

if(i < str.length() - 1) {

result.append(str.charAt(i + 1));

}

} else {

i++;

}

return result.toString();

}