Trim line - remove trailing newline from string

---

examples/trim-newline/trim.go

package main

import (
    "fmt"
    "strings"
)

func main() {
    line := "hello\n"
    line = strings.TrimSuffix(line, "\n") // remove newline
    fmt.Printf("'%s'\n", line)

    line = strings.TrimSuffix(line, "\n") // not bothered if there was no newline
    fmt.Printf("'%s'\n", line)

    line = "hello\n\n"
    line = strings.TrimSuffix(line, "\n") // removing only one newline
    fmt.Printf("'%s'\n", line)
}

'hello'
'hello'
'hello
'