LeftPad in Go

package main
import "fmt"
import "strings"
func leftPad(str string,
             paddedLength int,
             ch string) string {
  if len(ch) != 1 {
    fmt.Println("Invalid Input, Throw here")
    return str
  }
  if len(str) > paddedLength {
    return str
  }
  paddedLength = paddedLength - len(str)
  return strings.Repeat(ch, paddedLength) + str
}
func main(){
  fmt.Println(leftPad("1", 1, "."))
  fmt.Println(leftPad("2", 2, "."))
  fmt.Println(leftPad("3", 3, "."))
  fmt.Println(leftPad("4", 4, "."))
  fmt.Println(leftPad("5", 5, "."))
  fmt.Println(leftPad("hello", 7, "."))
  fmt.Println(leftPad("foo",  6, "."))
  fmt.Println(leftPad("foo", 3, "."))
  fmt.Println(leftPad("foobar", 3, "."))
  fmt.Println(leftPad("foo", 6, "?"))
}