Write a JavaScript program to check whether a string "Script" presents at 5th (index 4) position in a given string, if "Script" presents in the string return the string without "Script" otherwise return the original one

function check_script(str)
{
  if (str.length < 6) {
    return str;
  }
  let result_str = str;
    
  if (str.substring(10, 4) == 'Script') 
    {
    
   result_str = str.substring(0, 4) + str.substring(10,str.length);
      
  }
  return result_str;
}

console.log(check_script("JavaScript"));
console.log(check_script("CoffeeScript"));