How to make the first letter of a string uppercase in Go Language?

How to make the first letter of a string uppercase, but not change the case of any of the other letters?

For Example:

"go language is awesome" → "Go language is awesome"
"hello world" → "Hello world"

Solution 1: Easy

package main

import (
    "unicode"
)

// Main function
func main() {

    str := "go language is awesome"
    runes := []rune(str)
    if len(runes) > 0 {
        runes[0] = unicode.ToUpper(runes[0])
    }
    println(string(runes))
}

Output:

Solution 2: Easy

package main

import "strings"

// Main function
func main() {

    str := "go language is awesome"
    str = strings.ToUpper(string(str[0])) + str[1:]
    println(str)
}

Output:

Solution 3: Normal

package main

import (
    "unicode"
    "unicode/utf8"
)

// Main function
func main() {

    str := "go language is awesome"
    println(firstToUpper(str))
}

func firstToUpper(s string) string {
    if len(s) > 0 {
        r, size := utf8.DecodeRuneInString(s)
        if r != utf8.RuneError || size > 1 {
            up := unicode.ToUpper(r)
            if up != r {
                s = string(up) + s[size:]
            }
        }
    }
    return s
}

Output:

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