Add solution for Challenge 2 (#1194)

Co-authored-by: go-interview-practice-bot[bot] <230190823+go-interview-practice-bot[bot]@users.noreply.github.com>

Author: goholic

challenge-2/submissions/goholic/solution-template.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func main() {
+	// Read input from standard input
+	scanner := bufio.NewScanner(os.Stdin)
+	if scanner.Scan() {
+		input := scanner.Text()
+
+		// Call the ReverseString function
+		output := ReverseString(input)
+
+		// Print the result
+		fmt.Println(output)
+	}
+}
+
+// ReverseString returns the reversed string of s.
+func ReverseString(s string) string {
+	runes := []rune(s)
+	left, right := 0, len(runes)-1
+
+	for left < right {
+		runes[left], runes[right] = runes[right], runes[left]
+		left++
+		right--
+	}
+
+	return string(runes)
+}