Помогите разделить код на методы

 import java.util.Scanner; 
 
public class Main { 
    public static void main(String[] args) throws Exception { 
        Scanner scn = new Scanner(System.in); 
        String exp = scn.nextLine(); 
        char action = getAction(exp); 
        String[] data = getData(exp, action); 
 
        if (action == '*' || action == '/') { 
            validateMultiplicationOrDivision(data[1]); 
        } 
 
        for (int i = 0; i < data.length; i++) { 
            data[i] = data[i].replace("\"", ""); 
        } 
 
        String result = calculateResult(action, data); 
        printInQuotes(result); 
    } 
 
    static char getAction(String exp) throws Exception { 
        if (exp.contains(" + ")) { 
            return '+'; 
        } else if (exp.contains(" - ")) { 
            return '-'; 
        } else if (exp.contains(" * ")) { 
            return '*'; 
        } else if (exp.contains(" / ")) { 
            return '/'; 
        } else { 
            throw new Exception("Некорректный знак действия"); 
        } 
    } 
 
    static String[] getData(String exp, char action) { 
        String[] data; 
        switch (action) { 
            case '+': 
                data = exp.split(" \\+ "); 
                break; 
            case '-': 
                data = exp.split(" - "); 
                break; 
            case '*': 
                data = exp.split(" \\* "); 
                break; 
            case '/': 
                data = exp.split(" / "); 
                break; 
            default: 
                data = new String[0]; // technically unreachable 
        } 
        return data; 
    } 
 
    static void validateMultiplicationOrDivision(String data) throws Exception { 
        if (data.contains("\"")) { 
            throw new Exception("Строчку можно делить или умножать только на число"); 
        } 
    } 
 
    static String calculateResult(char action, String[] data) throws Exception { 
        String result = ""; 
        switch (action) { 
            case '+': 
                result = data[0] + data[1]; 
                break; 
            case '*': 
                int multiplier = Integer.parseInt(data[1]); 
                for (int i = 0; i < multiplier; i++) { 
                    result += data[0]; 
                } 
                break; 
            case '-': 
                int index = data[0].indexOf(data[1]); 
                if (index == -1) { 
                    result = data[0]; 
                } else { 
                    result = data[0].substring(0, index) + data[0].substring(index + data[1].length()); 
                } 
                break; 
            case '/': 
                int newLen = data[0].length() / Integer.parseInt(data[1]); 
                result = data[0].substring(0, newLen); 
                break; 
        } 
        return result; 
    } 
 
    static void printInQuotes(String text) { 
        if (text.length() > 40) { 
            System.out.println("\"" + text.substring(0, 40) + "...\""); 
        } else { 
            System.out.println("\"" + text + "\""); 
        } 
    } 
}