code: function parseOptional (params, section, stripped) {
    stripped = stripped.slice(0, -1)
    const key = (params && params[stripped]) || ''
  
    return {
      dst: key && key.toString() ? section : `/${section}`,
      src: key
    }
  }
docs: @function
  @private
  
  Parse optional parameters
  
  @param {Object} params The parameters to be inserted
  @param {string} section The section to be replaced
  @param {string} stripped The sections key
  @returns {*} Parsed source and destination for replacement