This code I made for my Elegoo Smart Car isn't working properly

Using Arduino Programming Questions
1

I was making a code for my Elegoo Smart car so the speed is not just HIGH(on) and LOW(off). The code is below:

int ENA =5;
int ENB = 6;
int IN1 = 7;
int IN2 = 8;
int IN3 = 9;
int IN4 = 11;
int speedProgress;
int speedProgressTwo;

void setup() {
Serial.begin(9600);//open serial and set the baudrate
pinMode(IN1,OUTPUT);//before useing io pin, pin mode must be set first
pinMode(IN2,OUTPUT);
pinMode(IN3,OUTPUT);
pinMode(IN4,OUTPUT);
pinMode(ENA,OUTPUT);
pinMode(ENB,OUTPUT);
digitalWrite(ENA, HIGH);
digitalWrite(ENB, HIGH);
}

//Repeat execution
void loop() {
speedProgress=100;
speedProgressTwo = 100;
speedI(speedProgress,speedProgressTwo);
forward();
delay(3000);
reverse();
delay(3000);
leftTurn();
delay(3000);
rightTurn();
delay(500);

delay(10000);

}

void forward(){
digitalWrite(IN1,HIGH);
digitalWrite(IN2,LOW);
digitalWrite(IN3,LOW);
digitalWrite(IN3,HIGH);
digitalWrite(IN4,LOW);
}

void rightTurn(){
digitalWrite(IN1,HIGH);
digitalWrite(IN2,LOW);
digitalWrite(IN3,HIGH);
digitalWrite(IN4,LOW);
}

void reverse(){
digitalWrite(IN1,LOW);
digitalWrite(IN2,HIGH);
digitalWrite(IN3,LOW);
digitalWrite(IN4,HIGH);

void leftTurn(){
digitalWrite(IN1,LOW);
digitalWrite(IN2,HIGH);
digitalWrite(IN3,LOW);
digitalWrite(IN4,HIGH);

}

void speedI(int speedProgress=100, int speedProgressTwo=100){
analogWrite(ENA,speedProgress);
analogWrite(ENB,speedProgressTwo);
}

However, whenever I compile it or try uploading it, it gives me this error message it is below.

^
speedProgressCar:69:61: error: a function-definition is not allowed here before '{' token
void speedI(int speedProgress=100, int speedProgressTwo=100){
^
speedProgressCar:72:1: error: expected '}' at end of input
}
^
exit status 1
'speedI' was not declared in this scope

Thanks

Disclaimer:
I do not own or am endorsed by Elegoo or Arduino.

2

Where does the function reverse end?

Please remember to use code tags when posting code

3

It should compile if you make two changes, see comments in all caps. The reverse function needs a curly brace and it seems the IDE forward declaration code does not work when there are default values for functions.

int ENA =5;
int ENB = 6;
int IN1 = 7;
int IN2 = 8;
int IN3 = 9;
int IN4 = 11;
int speedProgress;
int speedProgressTwo;

void setup() {
  Serial.begin(9600);//open serial and set the baudrate
  pinMode(IN1,OUTPUT);//before useing io pin, pin mode must be set first
  pinMode(IN2,OUTPUT);
  pinMode(IN3,OUTPUT);
  pinMode(IN4,OUTPUT);
  pinMode(ENA,OUTPUT);
  pinMode(ENB,OUTPUT);
  digitalWrite(ENA, HIGH);
  digitalWrite(ENB, HIGH);
}

// *************** MOVE TO BEFORE CALL
void speedI(int speedProgress=100, int speedProgressTwo=100){
  analogWrite(ENA,speedProgress);
  analogWrite(ENB,speedProgressTwo);
}

//Repeat execution
void loop() {
  speedProgress=100;
  speedProgressTwo = 100;
  speedI(speedProgress,speedProgressTwo);
  forward();
  delay(3000);
  reverse();
  delay(3000);
  leftTurn();
  delay(3000);
  rightTurn();
  delay(500);

  delay(10000);
 
}

void forward(){
  digitalWrite(IN1,HIGH);
  digitalWrite(IN2,LOW);
  digitalWrite(IN3,LOW);
  digitalWrite(IN3,HIGH);
  digitalWrite(IN4,LOW);
}

void rightTurn(){
  digitalWrite(IN1,HIGH);
  digitalWrite(IN2,LOW);
  digitalWrite(IN3,HIGH);
  digitalWrite(IN4,LOW);
}

void reverse(){
  digitalWrite(IN1,LOW);
  digitalWrite(IN2,HIGH);
  digitalWrite(IN3,LOW);
  digitalWrite(IN4,HIGH);
}                           // *************** ADDED CURLY BRACE

void leftTurn(){
  digitalWrite(IN1,LOW);
  digitalWrite(IN2,HIGH);
  digitalWrite(IN3,LOW);
  digitalWrite(IN4,HIGH);
 
}