Made adjustments based on HyagoOliveiran's suggestions

Tried to add more variables to increase legibility.
Added UpdateSlide function.
Deleted some empty lines.

UOP1_Project/Assets/Scripts/Characters/Character.cs

     [Tooltip("Each frame while jumping, gravity will be multiplied by this amount in an attempt to 'cancel it' (= jump higher)")] public float gravityDivider = .6f;
     [Tooltip("Adjust the friction of the slope")] public float slideFriction = 0.3f;
 
-
+    private float currentSlope;
-    
-
-        
-       
-        
-
         //Raises the multiplier to how much gravity will affect vertical movement when in mid-air
         //This is 0f at the beginning of a jump and will raise to maximum 1f
         if (!characterController.isGrounded)
         //Calculate the final verticalMovement
         if (!characterController.isGrounded)
         {
-
-
             //The character is either jumping or in freefall, so gravity will add up
             gravityContributionMultiplier = Mathf.Clamp01(gravityContributionMultiplier);
             verticalMovement += Physics.gravity.y * gravityMultiplier * Time.deltaTime * gravityContributionMultiplier; //Add gravity contribution
         {
             //Full speed ground movement
             movementVector = inputVector * speed;
-
             //Resets the verticalMovement while on the ground,
             //so that regardless of whether the player landed from a high fall or not,
             //if they drop off a platform they will always start with the same verticalMovement.
                 gravityContributionMultiplier = 0f;
             }
         }
-
-        // if player has to slide then add sideways speed to make it go down
-        if (shouldSlide)
-        {
-            movementVector.x += (1f - hitNormal.y) * hitNormal.x * (speed - slideFriction);
-            movementVector.z += (1f - hitNormal.y) * hitNormal.z * (speed - slideFriction);
-        }
-        
-
+        UpdateSlide();
-
-        // check if the controller is grounded and above slope limit
-        // if player is grounded and above slope limit
-        // player has to slide
-        shouldSlide = !(Vector3.Angle(Vector3.up, hitNormal) <= characterController.slopeLimit);
-
         //Rotate to the movement direction
         movementVector.y = 0f;
         if (movementVector.sqrMagnitude >= .02f)
             float permittedDistance = characterController.radius / 2f;
             float topPositionY = transform.position.y + characterController.height;
             float distance = Mathf.Abs(hit.point.y - topPositionY);
-
-
-
-
-
-
     public void Move(Vector3 movement)
     {
         inputVector = movement;
         isJumping = false; //This will stop the reduction to the gravity, which will then quickly pull down the character
     }
 
-   
+    private void UpdateSlide()
+    {
+        // if player has to slide then add sideways speed to make it go down
+        if (shouldSlide)
+        {
+            movementVector.x += (1f - hitNormal.y) * hitNormal.x * (speed - slideFriction);
+            movementVector.z += (1f - hitNormal.y) * hitNormal.z * (speed - slideFriction);
+        }
+        // check if the controller is grounded and above slope limit
+        // if player is grounded and above slope limit
+        // player has to slide
+        currentSlope = Vector3.Angle(Vector3.up, hitNormal);
+        shouldSlide = currentSlope >= characterController.slopeLimit;
+    }
 }