For problem statement at 0-999/600-699/660-669/665/problemC.txt this is a correct solution, but verifier at 0-999/600-699/660-669/665/verifierC.go ends with All tests passed can you fix the verifier? package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	in := bufio.NewReaderSize(os.Stdin, 1<<20)
	var s string
	fmt.Fscan(in, &s)

	a := []byte(s)
	n := len(a)

	for i := 1; i < n; i++ {
		if a[i] == a[i-1] {
			for c := byte('a'); c <= 'z'; c++ {
				if c != a[i-1] && (i+1 == n || c != a[i+1]) {
					a[i] = c
					break
				}
			}
		}
	}

	out := bufio.NewWriterSize(os.Stdout, 1<<20)
	out.Write(a)
	out.Flush()
}