MVI interview Questions - 1

I recently attaneded the interview at Mvi Technology. there i got some new Questions. in this blog i just share my questiions and asnwers in my next blogs i will share my experince on the interviews.

before move into the question gernral instruction
dont use any inbuil methods u can only use the length() and charAt() only. 4 questions only 60 minutes time.

Question - 1

1. input String s = "ABC124ABC1WEWE"; the output should be like this CBA124CBA1EWEW revers only the string dont reverse the numbers and this should stayed on the plce where it already presents.

public class Four {

    public static void main(String[] args) {
        String s = "ABC124ABC1WEWE";
        int start = 0, end = 0;
        String s1 = "";
        for (int i = 0; i < s.length(); i++) {

            if ((s.charAt(i) >= 'a' && s.charAt(i) <= 'z') || (s.charAt(i) >= 'A' && s.charAt(i) <= 'Z')) {
                end++;
            } else {
                if (end != start) {
                    s1 += rev(s, start, end);
                }
                s1 += s.charAt(i);
                start = i + 1;
                end = start;
            }
        }
        if (end != start) {
            s1 += rev(s, start, end);
        }
        System.out.println(s1);
    }

    public static String rev(String s, int st, int e) {
        String s2 = "";
        for (int i = e - 1; i >= st; i--) {
            s2 += s.charAt(i);
        }
        return s2;
    }

}

output : CBA124CBA1EWEW