void setup() 
{
    Serial.begin(9600);
}

void loop() 
{
    Serial.println("Input 1 and press Enter:");
    while (Serial.available() == 0) {}     // Wait for user to inpu data
    String teststr = Serial.readString();  // Read the data
    teststr.trim();                        // Remove any \r \n whitespace at the end of the String

    if (teststr == "1") 
    {
        Serial.println("Input any character to continue:");
        while (Serial.available() == 0) {}         // Wait
        String inputChar = Serial.readString();    // Read
        inputChar.trim();                          // Remove

        if (inputChar) 
        {                                  
            String teststr2;                       //declear the word user will input
            bool validColor = false;               //is the input word a valid color?  this bool variable is a Indicator falg in the entrancy gat of while loop below.
                                                   //give it a inital false so that program can enter the while loop
            while(!validColor)                     //if the word is not color, come back to here, otherwise the valid color will allow program doing process then go back to main while loop
            {
              Serial.println("Select the color of the part (Red, Green, Blue, Orange):");
              //Serial.println(Serial.readString());
              while (Serial.available() == 0) {}    //Wait
              teststr2 = Serial.readString();       //Read
              teststr2.trim();                      //Remove
              teststr2.toLowerCase();               //user might input RED, Red, REd, even rEd! bcs they are fkin stupid
                                                    //turn all characters to lowcase to elimate Misinterpretation
              if (teststr2 == "red") 
                {
                    Serial.println("The red part has been picked and placed in the red bin.\n");
                    validColor = true;              //sucess of input color will make program wouldn't come back to this while when we set validColor is true
                } 
                else if (teststr2 == "green") 
                {
                    Serial.println("The green part has been picked and placed in the green bin.\n");
                    validColor = true;
                } 
                else if (teststr2 == "blue") 
                {
                    Serial.println("The blue part has been picked and placed in the blue bin.\n");
                    validColor = true;
                } 
                else if (teststr2 == "orange") 
                {
                    Serial.println("The orange part has been picked and placed in the orange bin.\n");
                    validColor = true;
                } 
                else 
                {
                    Serial.println("Error: Invalid color. Please try again.\n");     
                    validColor = false;
                }

            }
            
            
        }
    } 
    else 
    {
        Serial.println("Invalid input. Try again.\n");
    }
}