Convert snake case value to title case

snake_case_to_title_case.xml

<mvt:comment> 
Null the current status value
</mvt:comment>
<mvt:assign name="l.final_outputted_value" value="''" />

<mvt:comment> 
Substring placeholder
</mvt:comment>
<mvt:assign name="l.substring" value="'placeholder'" />

<mvt:comment>
Current token position
</mvt:comment>
<mvt:assign name="l.position" value="1" />

<mvt:comment> 
While get token is returning a substring continue
</mvt:comment>
<mvt:while expr="NOT ISNULL l.substring">
  <mvt:comment> 
  Return substring
  </mvt:comment>
  <mvt:assign name="l.substring" value="gettoken( l.delimited_string, '_', l.position)" />

  <mvt:comment> 
  Concat custom order status. Each custom order status will be snake case
  and will be formatted to be title case. For example, "order_processing" -> "Order Processing"
  </mvt:comment>
  <mvt:assign name="l.final_outputted_value" value="l.final_outputted_value $ toupper(substring( l.substring, 1, 1 )) $ substring( l.substring, 2, len_var(l.substring)) $ ' '" />

  <mvt:comment> 
  Increment position index
  </mvt:comment>
  <mvt:assign name="l.position" value="l.position + 1" />
</mvt:while>