Arduino: redefinition of a function error
<p>"Getting the error message:</p>

<blockquote>
  <p>"error: 'int ButtonStateNext' previously declared here"   (line 7 is
  where the issue lies)</p>
  
  <p>"exit status 1"</p>
  
  <p>"redefinition of 'int ButtonStateNext'</p>
</blockquote>

<p>Whenever I try to compile my arduino program..Could someone shed some light on what exactly is going wrong? I understand that the error message is telling me that i've declared ButtonNextState previously, but I see nowhere that i've done so (atleast, intentionally?). The below is the entirety of the code (posted it all since its minimal) Thanks.</p>

<pre><code>String ButtonState;
int Pin = 4;
unsigned long timer;
int input;

//function that is to be called in loop to service
int ButtonNextState( input ) {
//Switch statement based on state
    switch( ButtonState )
    {       
        case Idle:
            if(input == LOW)
            {
                //Record time
                timer = millis();
                //Set ButtonState to wait
                ButtonState = "Wait";
            }
            break;
        case Wait:
            if(input == HIGH)
            {
                ButtonState = "Idle";
            }
            else if(timer &gt;= 5)
            {
                ButtonState = "Low";
                return 1;
            }
            break;
        case Low:
            if(input == HIGH)
            {
                ButtonState = "Idle";
            }
            break;
    } //end of switch statement

    return 0; // By default, return 0 indicating nothing is happening    
}

void setup() {
    //Set pin as input
    input = 4;
    //Set ButtonState to Idle
    ButtonState = "Idle";
}

void loop() {
    if( ButtonNextState( digitalRead( input ) ) )
    {
        //Send serial message indicating button press
        Serial.write("Button Pressed.");
    }
}
</code></pre>