String st1 = "Al-Huson";
String st2 = "College";

void setup() {
  Serial.begin(9600);
    
      // Printing original strings
        Serial.println("Original Strings:");
          Serial.println("st1: " + st1);
            Serial.println("st2: " + st2);
              Serial.println();

                // Concatenating st1 and st2
                  String combined = st1 + " " + st2;
                    Serial.println("Concatenated String:");
                      Serial.println(combined);
                        Serial.println();

                          // Getting the length of each string
                            Serial.print("Length of st1: ");
                              Serial.println(st1.length());
                                Serial.print("Length of st2: ");
                                  Serial.println(st2.length());
                                    Serial.println();

                                      // Changing st1 to uppercase
                                        st1.toUpperCase();
                                          Serial.println("st1 in uppercase:");
                                            Serial.println(st1);
                                              Serial.println();

                                                // Changing st2 to lowercase
                                                  st2.toLowerCase();
                                                    Serial.println("st2 in lowercase:");
                                                      Serial.println(st2);
                                                        Serial.println();

                                                          // Checking if st1 contains "HUSON"
                                                            Serial.print("Does st1 contain 'HUSON'? ");
                                                              Serial.println(st1.indexOf("HUSON") != -1 ? "Yes" : "No");
                                                                Serial.println();

                                                                  // Substring example
                                                                    String sub = combined.substring(3, 8);
                                                                      Serial.println("Substring of combined from index 3 to 8:");
                                                                        Serial.println(sub);
                                                                          Serial.println();
                                                                          }

                                                                          void loop() {
                                                                            // put your main code here, to run repeatedly:
                                                                            }