message: [client] fix a typo in a function name
  Closes:
  Approved by: tzakian
diff: @@ -454,7 +454,7 @@ impl ClientProxy {
  .map(|s| s == &"use_base_units")
  .unwrap_or(false);
  let num_coins = if !use_base_units {
  - self.convert_to_on_chain_represenation(space_delim_strings[2], mint_currency)?
  + self.convert_to_on_chain_representation(space_delim_strings[2], mint_currency)?
  } else {
  Self::convert_to_scaled_representation(space_delim_strings[2], 1, 1)?
  };
  @@ -876,7 +876,7 @@ impl ClientProxy {
  let transfer_currency = space_delim_strings[4];
  let num_coins =
  - self.convert_to_on_chain_represenation(space_delim_strings[3], transfer_currency)?;
  + self.convert_to_on_chain_representation(space_delim_strings[3], transfer_currency)?;
  let gas_unit_price = if space_delim_strings.len() > 5 {
  Some(space_delim_strings[5].parse::<u64>().map_err(|error| {
  @@ -1559,7 +1559,7 @@ impl ClientProxy {
  }
  /// convert number of coins (main unit) given as string to its on-chain represention
  - pub fn convert_to_on_chain_represenation(
  + pub fn convert_to_on_chain_representation(
  &mut self,
  input: &str,
  currency: &str,
  