Infrastructure/Functions.php
public static function removeLastCharsFromString(string $input, int $numChars = 1): string 
    {
        if ($numChars > strlen($input)) {
            throw new \InvalidArgumentException("Cannot remove $numChars from $input");
        }
        return substr($input, 0, strlen($input) - $numChars);
    }
public static function removeLastCharsFromString(string $input, int $numChars = 1): string 
    {
        if ($numChars > strlen($input)) {
            throw new \InvalidArgumentException("Cannot remove $numChars from $input");
        }
        return substr($input, 0, strlen($input) - $numChars);
    }
string length must be >= numChars