adding old solved challenges

SubString/SubString.java

@@ -0,0 +1,25 @@
+package SubString;
+
+import java.util.Scanner;
+
+public class SubString {
+  public static void main(String[] args) {
+
+    System.out.println(subString());
+  }
+
+  private static String subString() {
+    Scanner sc = new Scanner(System.in);
+    String str = sc.next();
+    int start = sc.nextInt();
+    int end = sc.nextInt();
+    char[] ltrs = str.toCharArray();
+    String subStr = "";
+
+    for (int i = start; i < end; i++) {
+      subStr += Character.toString(ltrs[i]);
+    }
+    sc.close();
+    return subStr;
+  }
+}