Flatten all files from contracts folder and save to flattened directory

flatten_contracts.sh

#!/bin/bash

CONTRACTS_DIR="./contracts"
FLATTENED_DIR="./flattened"

mkdir -p "$FLATTENED_DIR"

for FILE in "${CONTRACTS_DIR}"/*.sol; do
  if [[ -f "$FILE" ]] && [[ -r "$FILE" ]]; then
    FILE_NAME="$(basename "${FILE%.sol}")"

    npx hardhat flatten "${FILE}" > "${FLATTENED_DIR}/${FILE_NAME}_flattened.sol"
  fi
done