public static String maxCommonStr(String s1, String s2){
String maxStr = "";
for (int end= 1, begin = 0; end <= s1.length();){
String str = s1.substring(begin, end);
if(s2.contains(str)){
maxStr = str.length() > maxStr.length()? str : maxStr;
end++;
}else{
begin++;
if(begin == end)end++;
}
}
return maxStr;
}








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