read a file and print the count of lines

package main

import (
  "io";
  "fmt";
  "os";
  "strings";
)

func main() {
  // read the file in bytes array
  b, err := io.ReadFile("readfile.go");
  if err!=nil {
    fmt.Println("error on read file");
    os.Exit(-1);
  } 
  
  // convert from bytes to string
  strbuffer := string(b);

  // split into lines
  lines := strings.Split(strbuffer, "\n", 0);

  // iterate each
  for i, line := range lines {
    fmt.Printf("%d:  %s\n", i, line);
  }
}