How to use the eth-sig-util.normalize function in eth-sig-util

async addToken (rawAddress, symbol, decimals, image) {
    const address = normalizeAddress(rawAddress)
    const newEntry = { address, symbol, decimals }
    const tokens = this.store.getState().tokens
    const assetImages = this.getAssetImages()
    const previousEntry = tokens.find((token) => {
      return token.address === address
    })
    const previousIndex = tokens.indexOf(previousEntry)

    if (previousEntry) {
      tokens[previousIndex] = newEntry
    } else {
      tokens.push(newEntry)
    }
    assetImages[address] = image
    this._updateAccountTokens(tokens, assetImages)
    return Promise.resolve(tokens)

addSuggestedERC20Asset (tokenOpts) {
    this._validateERC20AssetParams(tokenOpts)
    const suggested = this.getSuggestedTokens()
    const { rawAddress, symbol, decimals, image } = tokenOpts
    const address = normalizeAddress(rawAddress)
    const newEntry = { address, symbol, decimals, image }
    suggested[address] = newEntry
    this.store.updateState({ suggestedTokens: suggested })
  }

hexToBn (hex) {
    return new BN(normalize(hex).substring(2), 16)
  }

addSuggestedERC20Asset (tokenOpts) {
    this._validateERC20AssetParams(tokenOpts)
    const suggested = this.getSuggestedTokens()
    const { rawAddress, symbol, decimals, image } = tokenOpts
    const address = normalizeAddress(rawAddress)
    const newEntry = { address, symbol, decimals, image }
    suggested[address] = newEntry
    this.store.updateState({ suggestedTokens: suggested })
  }

setAccountLabel (account, label) {
    if (!account) throw new Error('setAccountLabel requires a valid address, got ' + String(account))
    const address = normalizeAddress(account)
    const {identities} = this.store.getState()
    identities[address] = identities[address] || {}
    identities[address].name = label
    this.store.updateState({ identities })
    return Promise.resolve(label)
  }

const hexWallets = newWallets.map((w) => {
      return sigUtil.normalize(w.getAddress().toString('hex'))
    })
    return Promise.resolve(hexWallets)

async addToken (rawAddress, symbol, decimals, image) {
    const address = normalizeAddress(rawAddress)
    const newEntry = { address, symbol, decimals }
    const tokens = this.store.getState().tokens
    const assetImages = this.getAssetImages()
    const previousEntry = tokens.find((token) => {
      return token.address === address
    })
    const previousIndex = tokens.indexOf(previousEntry)

    if (previousEntry) {
      tokens[previousIndex] = newEntry
    } else {
      tokens.push(newEntry)
    }
    assetImages[address] = image
    this._updateAccountTokens(tokens, assetImages)
    return Promise.resolve(tokens)

      const tokenAddresses = this.getTokens().filter(token => token.address === normalizeAddress(rawAddress))
      return tokenAddresses.length > 0