error CS1525: Unexpected symbol `public' Urgent help needed!!

So I can't find what has cause this error or to be specific why it is an unexpected symbol... :/ Pls help!! error line: public void SetSpeed(float modifier)...

 using UnityEngine;
 using System.Collections;
 
 public class PlayerMotor : MonoBehaviour 
 {
     private CharacterController controller;
     private Vector3 moveVector;
 
     private float speed = 10.0f;
     private float verticalVelocity = 0.0f;
     private float gravity = 5.0f;
         
     private float animationDuration = 3.0f;
 
     // Use this for initialization
     void Start () {
         controller = GetComponent<CharacterController> ();
     }
 
     // Update is called once per frame
     void Update () {
 
         if (Time.time < animationDuration) 
         {
             controller.Move (Vector3.forward * speed * Time.deltaTime);
             return;
         }
 
         moveVector = Vector3.zero;
 
         if (controller.isGrounded) 
         {
             verticalVelocity = -0.5f;
         } 
         else
         {
             verticalVelocity -= gravity * Time.deltaTime;
         }
 
         // X - Left and Right
         moveVector.x = Input.GetAxisRaw("Horizontal") * speed;
 
         // Y - Up and Down
         moveVector.y = verticalVelocity;
 
         // Z - Forward and Backward
         moveVector.z = speed;
 
         controller.Move (moveVector * Time.deltaTime);
 
         **public** void SetSpeed(float modifier)
         {
             speed = 10.0f + modifier;
         }
     }