// https://www.robotronix.co.il
// String Programming Exercises - Robotics and Microcontrollers
// Learn C Strings, Arduino and ESP32 Programming

#include <string.h>       // Include C string functions

char buf[80];             // Buffer for string operations
char source[40];          // Buffer for the source string

void setup() {            // Run once at startup

    Serial.begin(115200); // Start serial communication
    Serial.println("---------------------------------------");

    // Example 1: strcpy - Copy a string

    strcpy(source, "http://www.robotronix.co.il"); // Store website address
    strcpy(buf, source);                           // Copy source into buf

    Serial.print("1 - Copied string: "); // Print label
    Serial.println(buf);                // Print copied string

    // Example 2: strcat - Concatenate two strings

    strcat(buf, "/product-category/robotics/"); // Add text to the string

    Serial.print("2 - Combined string: "); // Print label
    Serial.println(buf);                  // Print combined string

    // Example 3: strlen - Get string length

    size_t length = strlen(buf);          // Count characters in the string

    Serial.print("3 - String length: ");  // Print label
    Serial.println(length);              // Print string length

    // Example 4: strstr - Find a substring

    if (strstr(buf, ".co.il") != NULL) {  // Search for ".co.il"

        Serial.println("4 - Substring .co.il found");

    } else {                             // Substring does not exist

        Serial.println("4 - Substring not found");
    }

    // Example 5: strcmp - Compare two strings

    const char* key = "12345";           // Define the correct password
    char userInputKey[20];               // Store the entered password

    strcpy(userInputKey, "24923");       // Set example password

    int comparison = strcmp(key, userInputKey); // Compare passwords

    if (comparison == 0) {               // Strings are identical

        Serial.println("5 - Password correct");

    } else {                             // Strings are different

        Serial.println("5 - Wrong password");
    }
}

void loop() {                            // Run continuously
    // Nothing to execute
}