go-padding generate a padded string according to the specified length. We can specify whether we want string to be padded on the left or the right.

For your reference, we can pad with 0 and spece by using fmt package. Therefore, we don't need use go-padding if you just want to pad with 0 and spece.

$ go get github.com/mogi86/go-padding

package main

import (
	"fmt"
	"github.com/mogi86/go-padding"
)

func main() {
	s := "hello"
	padded, err := padding.Pad(s, 20, "!", padding.PadRight)
	if err != nil {
		fmt.Printf("padding failed: %v\n", err)
	}

	fmt.Printf("padded string: %s\n", padded)
}

• Output

padded string: hello!!!!!!!!!!!!!!!