old_contents: from .string import (
      force_bytes,
      force_text,
  )
  from .types import (
      is_bytes,
  )
  
  
  def pad_left(string, chars, filler="0"):
      """
      Should be called to pad string to expected length
      """
      numchars = chars - len(string)
      head = ""
      if numchars > 0:
          head = filler * numchars
      return head + string
  
  
  def pad_right(string, chars, filler="0"):
      """
      Should be called to pad string to expected length
      """
      numchars = chars - len(string)
      tail = ""
      if numchars > 0:
          tail = filler * numchars
      return string + tail
  
  
  def is_prefixed(value, prefix):
      return value.startswith(
          force_bytes(prefix) if is_bytes(prefix) else force_text(prefix)
      )
  
  
  def is_0x_prefixed(value):
      return is_prefixed(value, '0x')
  
  
  def remove_0x_prefix(value):
      if is_0x_prefixed(value):
          return value[2:]
      return value
  
  
  def add_0x_prefix(value):
      if is_0x_prefixed(value):
          return value
  
      prefix = b'0x' if is_bytes(value) else '0x'
      return prefix + value
  
new_contents: from .string import (
      force_bytes,
      force_text,
  )
  from .types import (
      is_bytes,
  )
  
  
  def pad_left(string, chars, filler="0"):
      """
      Should be called to pad string to expected length
      """
      numchars = chars - len(string)
      head = ""
      if numchars > 0:
          head = filler * numchars
      return head + string
  
  
  def pad_right(string, chars, filler="0"):
      """
      Should be called to pad string to expected length
      """
      numchars = chars - len(string)
      tail = ""
      if numchars > 0:
          tail = filler * numchars
      return string + tail
  
  
  def is_prefixed(value, prefix):
      return value.startswith(
          force_bytes(prefix) if is_bytes(value) else force_text(prefix)
      )
  
  
  def is_0x_prefixed(value):
      return is_prefixed(value, '0x')
  
  
  def remove_0x_prefix(value):
      if is_0x_prefixed(value):
          return value[2:]
      return value
  
  
  def add_0x_prefix(value):
      if is_0x_prefixed(value):
          return value
  
      prefix = b'0x' if is_bytes(value) else '0x'
      return prefix + value
  
subject: fix util