When using Horizontal or Vertical input keys, the the movement is normal. But when trying to move diagonal, multiple keys are to be pressed, and the speed just stacks up.

Yes there are many answers to such questions. But I'm having a hard time figuring out a solution. I am actually using an asset, and the code is kinda hard to understand for me. The script is on my drive and the link is below: https://drive.google.com/open?id=1Lt4DZBw7Jv2LNyYR-03aNUpV2a29F7dm

Please provide a solution. I am not so good at coding. And I'm in real need to make that game because of many reasons as fast as I can so I will learn all coding later. (and in the script please search for Move, Movement or related words to go to specific movement code, thank you a lot)