我可以用make或new在golang中预填充字符串吗？

I am trying to optimize my stringpad library in Go. So far the only way I have found to fill a string (actually bytes.Buffer) with a known character value (ex. 0 or " ") is with a for loop.

the snippet of code is:

// PadLeft pads string on left side with p, c times
func PadLeft(s string, p string, c int) string {
    var t bytes.Buffer
    if c <= 0 {
        return s
    }
    if len(p) < 1 {
        return s
    }
    for i := 0; i < c; i++ {
        t.WriteString(p)
    }
    t.WriteString(s)
    return t.String()
}

The larger the string pad I believe there is more memory copies of the t buffer. Is there a more elegant way to make a known size buffer with a known value on initialization?