Having trouble with my attack animation code

Hi

I recently got into Unity Development and wanted to start off with a small 2D game to learn the engine. In this game the character has some sprite animations and one of these is the attack animation. I created the others with the help of this Unity tutorial

So I then imported my attack animation and added some code to get it to work. It did not work when I pressed my input key 'C' Here is my code and I have changed to bold the parts in which I have attempted to add the attack animation code.

 using UnityEngine;
 using System.Collections;
 
 public class PlayerController : MonoBehaviour {
 
     public float maxSpeed = 10f;
     bool facingRight = true;
 
     Animator anim;
 
     **public bool attack = false;**
     bool grounded = false;
     public Transform groundCheck;
     float groundRadius = 0.2f;
     public LayerMask isGround;
     public float jumpForce = 700f;
 
     void Start () {
 
         anim = GetComponent<Animator> ();
     
     }
 
     void FixedUpdate () {
 
         grounded = Physics2D.OverlapCircle (groundCheck.position, groundRadius, isGround);
         anim.SetBool ("Ground", grounded);
 
 
         anim.SetFloat ("vSpeed", GetComponent<Rigidbody2D>().velocity.y);
 
         float move = Input.GetAxis ("Horizontal");
 
         anim.SetFloat ("speed", Mathf.Abs (move));
 
         GetComponent<Rigidbody2D>().velocity = new Vector2(move * maxSpeed,  GetComponent<Rigidbody2D>().velocity.y);
 
         if (move > 0 && !facingRight)
             Flip ();
         else if (move < 0 && facingRight)
             Flip ();
 }
 
     void Update(){
 
 
         if (grounded && Input.GetKeyDown (KeyCode.Space)) {
             anim.SetBool("Ground", false);
             GetComponent<Rigidbody2D>().AddForce(new Vector2(0,jumpForce));
 
         **if (grounded && Input.GetKeyDown(KeyCode.C)){**
                 **anim.SetBool("Attack", true);**
                 **attack = true;**
             }
         }
     }
 
     void Flip(){
         facingRight = !facingRight;
         Vector3 theScale = transform.localScale;
         theScale.x *= -1;
         transform.localScale = theScale;
     }
 
 }

After this I then went into my 'Animator' tab and created a boolean parameter called 'Attack' and then transitions to all other animations from and to attack with the conditions of attack is false to change from attack to a different state and attack is true to change from a state to attack.

If you need any more info or images of any kind I can provide it.

Thank you very much!

edit: realized you cant bold code text so my attack animation code has ** on either side