TruncateString

Truncates a string up to a specified length.

• Use len() to determine if the length is greater than l.
• Return the string truncated to the desired length, with "..." appended to the end or the original string.

func TruncateString(s string, l int) string {
    r := s
    if len(s) > l {
        if l > 3 {
            l -= 3
        }
        r = s[0:l] + "..."
    }
    return r
}

TruncateString("boomerang", 7); // "boom..."