// Removes all whitespace characters
// from the left start of a given string.
def ltrim(s) do
  i = 0
  while isWhitespace(s[i]) and i < len(s) do
    i = i + 1
  end

  out = ""
  while i < len(s) do
    out = out + s[i]
    i = i + 1
  end
  out
end

// Removes all whitespace characters
// from the right start of a given string.
def rtrim(s) do
  i = len(s) - 1
  while isWhitespace(s[i]) and i > 0 do
    i = i - 1
  end

  out = ""
  j = 0
  while j <= i do
    out = out + s[j]
    j = j + 1
  end
  out
end

// Removes all whitespace characters
// from the left and right of a given string.
def trim(s) do
  s |> ltrim() |> rtrim()
end

// Splits a given string at some delimiter.
// Returns a list of strings.
def split(s, delim = " ") do
  out = []
  curr = ""
  for c in s do
    if c == delim do
      push(out, curr)
      curr = ""
    else
      curr = curr + c
    end
  end

  if curr != "" do
    push(out, curr)
  end

  out
end