fix

transfer-sol/program/src/processor.rs

@@ -15,6 +15,10 @@ pub fn process_instruction(
     accounts: &[AccountInfo],
     input: &[u8],
 ) -> ProgramResult {
+    // Set return data to the integer value which is 1u8; 8 bytes long
+    let return_data = [1u8; 8];
+    set_return_data(&return_data);
+
     let instruction = TransferInstruction::try_from_slice(input)?;
     match instruction {
         TransferInstruction::CpiTransfer(args) => transfer_sol_with_cpi(accounts, args),

transfer-tokens/src/processor.rs

@@ -25,7 +25,7 @@ pub fn process_instruction(
 ) -> ProgramResult {
     // Create an iterator to safely reference accounts in the slice
     let account_info_iter = &mut accounts.iter();
-    // Set return data to the integer value which is incrementing for each function call
+    // Set return data to the integer value which is 1u8; 8 bytes long
     let return_data = [1u8; 8];
     set_return_data(&return_data);
     // As part of the program specification the instruction gives: