Hello eveyone, i want to make a footstep sound but my code doesn't make the audio work properly

Thr problem is that most likely you run PlayFootStepAudio() in update and so as long as the character is on the ground, the audio source will play a footstep sound each frame. It depends on the game but if you have animation to the character, you could add 2 events on the animation (1 for each foot) to trigger the PlayFootStepAudio function and if not, you could run this code with a given delay between each step. I will attach the code for the second case

 private float lastPlayTime = 0f;
 private float delayBetweenSteps = 0.5f;
 
 private void PlayFootStepAudio()
 {
     if (!m_CharacterController.isGrounded || Time.time - lastPlayTime <= delayBetweenSteps)
     {
         return;
     }
 
     lastPlayTime = Time.time
     // pick & play a random footstep sound from the array,
     // excluding sound at index 0
     int n = Random.Range(1, m_FootstepSounds.Length);
     m_AudioSource.clip = m_FootstepSounds[n];
     m_AudioSource.PlayOneShot(m_AudioSource.clip);
     // move picked sound to index 0 so it's not picked next time
     m_FootstepSounds[n] = m_FootstepSounds[0];
     m_FootstepSounds[0] = m_AudioSource.clip;
 }

Well, you could change this:

 m_AudioSource.clip = m_FootstepSounds[n];
 m_AudioSource.PlayOneShot(m_AudioSource.clip);

For this:

  m_AudioSource.PlayOneShot(m_FootstepSounds[n].clip);