Creating implementation for idiom 215 : Pad string on the left

Idiom

# 215 Pad string on the left

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Prepend extra character _c at the beginning of string _s to make sure its length is at least _m.
The length is the number of characters, not the number of bytes.

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import "strings"
import "utf8"

if n := utf8.RuneCountInString(s); n < m {
	s = strings.Repeat(c, m-n) + s
}

Demo
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LazUtf8

s := UTF8PadLeft(s,m,c);

s = s.rjust(m, c)

s.rjust(m, c)

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