go: add «179. Largest Number»

Signed-off-by: Matej Focko <me@mfocko.xyz>

go/largest-number.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"cmp"
+	"slices"
+	"strconv"
+)
+
+func largestNumber(nums []int) string {
+	numbers := make([]string, len(nums))
+	for i, num := range nums {
+		numbers[i] = strconv.Itoa(num)
+	}
+
+	slices.SortFunc(numbers, func(a, b string) int {
+		return cmp.Compare(b+a, a+b)
+	})
+
+	if numbers[0] == "0" {
+		return "0"
+	}
+
+	largest := ""
+	for _, number := range numbers {
+		largest += number
+	}
+
+	return largest
+}