#!/bin/bash

	if [ "$FINALS_VAR" != "proglang" ];then
		echo "ERROR: FINALS_VAR must be set to 'proglang'."
		echo "Current value: '${FINALS_VAR}'"
		exit 1
	fi

	if[ "$1" != "dsc31"]; then
		echo "ERROR: The first argument must be 'dsc31'."
		echo "Usage: $0 dsc31"
		exit 1
	fi

	LENGTH=500
	USER_NAME=$(whoami)

	USER_LEN=${#USER_NAME}

	RANDOM_LEN$((LENGTH - USER_LEN))

	RANDOM_PART=$(tr -dc 'A-Za-z0-9' < /dev/urandom | head -c $RANDOM_LEN)

	INSERT_POS=$((RANDOM_LEN / 2))
	
	FINAL_STRING="${RANDOM_PART:0:$INSERT_POS}${USER_NAME}$RANDOM_PART:$INSERT_POS}"

	echo "$FINAL_STRING"