The porous of this assignment is to refresh you on structural programming you learn on COSSC1436. Type the following 4 programs separately, compile/run and submit your work, the screenshot of run time and the.java file for each program separately for each program. 1) string manipulation public class String Operations public static void main(String[] args) { String stringi = "Hello"; String string2 = "Caron"; String string3 = ""; //empty String or null string3 "How are you string2.concat(string); System.out.println("string3: "+ string3); //get length System.out.println("Length: "+ stringi. Length()); //get substring beginning with character e, up to, but not //including character 5 System.out.println("Sub: " + string3.substring(0,5)); //uppercase System.out.println("Upper: "+string3.toUpperCase()); } } Add the following lines to above program: string strl-"Hello this is a test"; String str2 -stri.substring(6);//the sub is this is a test System.out.println(stri); System.out.println(str2); String str3-"Hello \tt this is a test"; str2 -str3.substring(6); System.out.println (str2)