import java.util.Arrays;
/*
    Aufgabe 2) Methoden rufen Methoden auf
*/
public class Aufgabe2 {
    public static void main(String[] args) {
        String text1 = "Hello World!";
        String text2 = "This is not a test!";
        int number1 = 123;
        int number2 = -123;
        System.out.println(expandString(text1, '-'));
        System.out.println(expandString(text1, '#'));
        System.out.println(expandString(text2, '.'));
        System.out.println(expandString(text2, ' '));
        System.out.println();
        System.out.println(expandNumber(number1, '*'));
        System.out.println(expandNumber(number2, '*'));
        System.out.println();
        System.out.println(Arrays.toString(expandToArray(text1, "A+/")));
        System.out.println(Arrays.toString(expandToArray(number1, ".:/")));
    }
    private static String expandString(String text, char sep){
        String str = "";
        for (int i = 0; i < text.length(); i++) {
            str = str + text.charAt(i);
            if (i < text.length() - 1){
                str = str + sep;
            }
        }
        return str;
    }
    private static String expandNumber(int num, char sep){
        int nDigits = 1;
        String str = "";
        if (num < 0){
            str = str + "-" + sep;
            num = Math.abs(num);
        }
        while(num >= nDigits) {
            nDigits = nDigits * 10;
        }
        nDigits /= 10;
        while(nDigits > 0) {

            str = str + num / nDigits;
            num %= nDigits;
            if (num > 0){
                str = str + sep;
            }
            nDigits /= 10;
        }
        return str;
    }
    private static String[] expandToArray(String text, String str) {
        String[] arr = new String[str.length()];
        int i = 0;
        while (i < str.length()) {
            if (arr[i] == null){
                arr[i] = "";
            }else {
                arr[i] = arr[i] + "{" + expandString(text, str.charAt(i)) + "}";
                i++;
            }
        }
        return arr;
    }
    private static String[] expandToArray(int num, String str){
        String[] arr = new String[str.length()];
        int i = 0;
        while (i < str.length()){
            if (arr[i] == null){
                arr[i] = "";
            }else {
                arr[i] = arr[i] + "{" + expandNumber(num, str.charAt(i)) + "}";
                i++;
            }
        }
        return arr;
    }
}