Problem with Ammo/Shoot script

Hello!

I have a problem with my ammo and shoot script. If I click the left mouse button it should shoot a projectil but I does not anything. Here is the script:

 var projectile : Rigidbody;
 
 var speed = 20;
 var MaxAmmo = 6;
 var CurrentAmmo = 6;
 var shotsFired = 0;
 
 var canFire = true;
 var canShootAgain = true;
 
 function Update() 
 
 {
 
 }
 
 function Shooting () {
 if (canFire == true)
        {
        if(canShootAgain == true)
        {
            if (Input.GetButton("Fire 1"))
            {
            canShootAgain = false;
           var instantiatedProjectile : Rigidbody = Instantiate(projectile, transform.position, transform.rotation );
 
         instantiatedProjectile.velocity = transform.TransformDirection( Vector3( 0, 0, speed ) );
 
         Physics.IgnoreCollision( instantiatedProjectile. collider,transform.root.collider );
         
            CurrentAmmo -= 1;
            shotsFired +=1;
            yield WaitForSeconds (1.5);
            canShootAgain = true;
              if(CurrentAmmo == 0)
              {
              canFire = false;
              }
            }
         }
     }
 
 }

It is a similar script which is somewhere posted.