Fix the logical Errors

[looly77]

//The method below should compare two strings,
//returns “same” if two Strings are identical.
//If they differ, determines the position of
//the first letter at which the two strings differs,
//and returns that position
public 
String compareStrings(String a,String b){

int 
pos =0;

if 
(a.equals(b)){

return 
"same";
}else{

while 
(b.charAt(pos)!=a.charAt(pos));
{
pos++;
}

return 
"They differ at position:" + pos;

}}