assert_msg.rs

use solana_program::{entrypoint::ProgramResult, msg, program_error::ProgramError};
pub fn assert_msg(statement: bool, err: ProgramError, msg: &str) -> ProgramResult {
    if !statement {
        msg!(msg);
        Err(err)
    } else {
        Ok(())
    }
}
// usage
assert_msg(
	*pda_ai.key == pda,
	MyError::WrongPDA.into(),
	"PDA for user was invalid.",
)?;