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public class MainActivity extends AppCompatActivity {
    EditText inputString;
    Button getResult;
    TextView result;
    String strForManipulation;
    String reversedString;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        inputString = findViewById(R.id.input_string_et);
        getResult = findViewById(R.id.get_result_bt);
        result = findViewById(R.id.show_result_tv);


        getResult.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                strForManipulation = inputString.getText().toString();
                reversedString = Anagram.mainReverseMethod(strForManipulation);
                result.setText(reversedString);

            }
        });
    }





public class Anagram {
    private static final String SEPARATOR = " ";

    public static String mainReverseMethod(String strForManipulation) {
        String check = "";
        int leftCounter = 0;


        StringBuilder string = new StringBuilder();
        StringBuilder stringBuilder = new StringBuilder();
        String[] splitString = strForManipulation.split(SEPARATOR);
        for (String word : splitString) {
            char[] everySymbol = word.toCharArray();
            int rightCounter = everySymbol.length - 1;

            while (leftCounter < rightCounter) {
                if (!Character.isLetter(everySymbol[leftCounter]))
                    leftCounter++;
                else if (!Character.isLetter(everySymbol[rightCounter]))
                    rightCounter--;

                else {
                    char tmp = everySymbol[leftCounter];
                    everySymbol[leftCounter] = everySymbol[rightCounter];
                    everySymbol[rightCounter] = tmp;
                    leftCounter++;
                    rightCounter--;
                }

            }
            stringBuilder.append(everySymbol).append(SEPARATOR);

            check = stringBuilder.toString();
//

        }
        return check;
    }


}