#!/usr/bin/env bash

knoe_trim() {
  local s="${1:-}"
  # Trim leading/trailing whitespace without invoking external tools.
  s="${s#${s%%[![:space:]]*}}"
  s="${s%${s##*[![:space:]]}}"
  printf '%s' "$s"
}

knoe_normalize_realm() {
  local realm
  realm=$(knoe_trim "${1:-}")
  if [[ -z "$realm" ]]; then
    printf '%s' ""
    return 0
  fi
  printf '%s' "$realm" | tr '[:lower:]' '[:upper:]'
}