fix abi generation

[alonmuroch]

for some reason abi generated like this

/// Call the transfer function
pub fn transfer(
&self,
caller: &Address,
args: &[u8],
) -> Option {
// Encode router call manually
let arg_len = args.len() as u8;
let mut encoded = [0u8; 256]; // Fixed buffer
encoded[0] = 0x02; // selector
encoded[1] = arg_len; // arg length
encoded[2..2 + arg_len as usize].copy_from_slice(args);
let data = &encoded[..2 + arg_len as usize];

    // Make the call
    call(caller, &self.address, data)
}