Some error in Code

#1

https://ide.codingblocks.com/s/341787.

This is the link to my code. There is some problem as i am getting empty string ArrayList as output.
The recursive call to the function is stored in variable restResult which is null after running.
Please help in finding my error

#2

change you myResult loop to

for( int i = 0 ; i < restResult.size(); i++ ) {
String res= restResult.get(i);
for ( int j = 0 ; j < res.length() ; j++ ) {
String val = res.substring(0,j)+c+res.substring(j);
myResult.add(val);
}
}