Converting Celsius to Fahrenheit with Go

This is a continuation of Converting Celsius to Fahrenheit with Python, and TypeScript, but in Go:

package main

import (
    "fmt"
    "math"
)

func c2f(c int) float64 {
    return float64(c)*9/5 + 32
}

func isMirror(a int, b int) bool {
    return reverseString(massage(a)) == massage(b)
}

func massage(n int) string {
    switch {
    case n < 10:
        return fmt.Sprintf("0%d", n)
    case n >= 100:
        return massage(n - 100)
    default:
        return fmt.Sprintf("%d", n)
    }
}

func reverseString(s string) string {
    runes := []rune(s)
    for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
        runes[i], runes[j] = runes[j], runes[i]
    }
    return string(runes)
}

func printConversion(c int, f int) {
    fmt.Println(fmt.Sprintf("%d°C ~= %d°F", c, f))
}

func main() {
    for c := 4; c < 100; c += 12 {
        var f = c2f(c)
        if isMirror(c, int(math.Ceil(f))) {
            printConversion(c, int(math.Ceil(f)))
        } else if isMirror(c, int(math.Floor(f))) {
            printConversion(c, int(math.Floor(f)))
        } else {
            break
        }
    }
}

Run it like this:

go run conversion.go

or build and run:

go build -o conversion-go conversion.go
./conversion-go

and the output becomes:

4°C ~= 40°F
16°C ~= 61°F
28°C ~= 82°F
40°C ~= 104°F
52°C ~= 125°F