You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: string_helpers.rb
    path of file: ./repos/vets-api/lib
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module StringHelpers
  extend Gem::Text

  module_function

  def capitalize_only(str)
    str.slice(0, 1).capitalize + str.slice(1..-1)
  end

  def mask_sensitive(string)
    string&.gsub(/.(?=.{4})/, '*')
  end

  def hyphenated_ssn(ssn)
    return if ssn.blank?

    "#{ssn[0..2]}-#{ssn[3..4]}-#{ssn[5..8]}"
  end

  def heuristics(str_a, str_b)
    {
      length: [str_a.length, str_b.length],
      only_digits: [str_a.scan(/^\d+$/).any?, str_b.scan(/^\d+$/).any?],
      encoding: [str_a.encoding.to_s, str_b.encoding.to_s],
      levenshtein_distance: levenshtein_distance(str_a, str_b)
    }
  end

  def filtered_endpoint_t
    
  def filter_misc_endpoints(rslt)
    # for endpoints of type '/cce/v1/patients/xxx/eligibility/<specialty>' replace <specialty> with zzz and
    # for endpoints of type '/facilities/v2/facilities/<id>' replace <id> with xxx
    # for endpoints of type '/vaos/v1/locations/<id>/clinics' replace <id> with xxx
    # for partial error responses, replace the trace ids with common label <id>
    # to provide better grouping in grafana
    case rslt
    when %r{/cce/v1/patients/xxx/eligibility/}
      "#{$LAST_MATCH_INFO}zzz"
    when %r{/facilities/v2/facilities/}
      "#{$LAST_MATCH_INFO}xxx"
    when /Could not get appointments from VistA Scheduling Service /
      "#{$LAST_MATCH_INFO}<id>"
    when %r{/vaos/v1/locations/[0-9A-Z]+/clinics$}
      '/vaos/v1/locations/xxx/clinics'
    else
      rslt
    end