gistfile1.txt

Input: "one two three"
Output: "eno owt eerht"

public static invertString(Char[] data, int index) {

int bankind = data.indexOf(' ', index);

if(bankind == -1) {
return data;
}
int i;

for(i = index ; i < index; i++) {
data[index] = data[bankind];
bankind--;
}

return invertString(data, i);

public static invertString(Char[] data, int index) {

int bankind = data.indexOf(' ', index);
int end = bankind;

if(bankind == -1) {
return data;
}

int i;

for(i = index ; i < end; i++) {
data[index] = data[bankind];
bankind--;
}

return invertString(data, i);

public static char[] revertString(char[] data, int index) {
int start = index;
int end = index;
while(data[end] != ' ' && end < data.length -1) {
end++;
}

if(end + 1 == data.length) {
end++;
}

for(int i = 0; i < (end - start) / 2; i++) {
char temp = data[end -1 -i];
data[end -1 -i] = data[start + i];
data[start + i] = temp;
}

if(end >= data.length -1) {
return data;
} else {
return revertString(data, end + 1);
}
}