Extract trimmed_hash function for future reuse

Co-authored-by: Stamates <stamates@hotmail.com>

apps/explorer_web/lib/explorer_web/templates/address/_responsive_hash.html.eex

@@ -1,4 +1,4 @@
 <span class="<%= if @contract do %>contract-address<% end %>">
   <span class="d-none d-md-none d-lg-inline"><%= @address_hash %></span>
-  <span class="d-md-block d-lg-none "><%= @address_hash |> to_string() |> String.slice(0..5) %>&ndash;<%= @address_hash |> to_string() |> String.slice(-6..-1) %></span>
+  <span class="d-md-block d-lg-none "><%= ExplorerWeb.AddressView.trimmed_hash(@address_hash) %></span>
 </span>

apps/explorer_web/lib/explorer_web/views/address_view.ex

@@ -1,7 +1,7 @@
 defmodule ExplorerWeb.AddressView do
   use ExplorerWeb, :view
 
-  alias Explorer.Chain.{Address, Wei, SmartContract}
+  alias Explorer.Chain.{Address, Hash, SmartContract, Wei}
 
   alias Explorer.ExchangeRates.Token
   alias ExplorerWeb.ExchangeRates.USD
@@ -63,5 +63,13 @@ defmodule ExplorerWeb.AddressView do
   end
 
   def smart_contract_verified?(%Address{smart_contract: %SmartContract{}}), do: true
+
   def smart_contract_verified?(%Address{smart_contract: nil}), do: false
+
+  def trimmed_hash(%Hash{} = hash) do
+    string_hash = to_string(hash)
+    "#{String.slice(string_hash, 0..5)}–#{String.slice(string_hash, -6..-1)}"
+  end
+
+  def trimmed_hash(_), do: ""
 end