package strand const testVersion = 3 // ToRNA a little bit faster than map solution func ToRNA(s string) string { r := make([]rune, len(s)) for i, v := range s { switch v { case 'G': r[i] = 'C' case 'C': r[i] = 'G' case 'T': r[i] = 'A' case 'A': r[i] = 'U' default: r[i] = v } } return string(r) }