feat: modularize the code.

misc.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"errors"
+	"log"
+	"net/http"
+	"os"
+)
+
+// Miscelaneous functions
+
+// Create directory if it doesn't exist
+func CreateDirIfNotExisting(d string) {
+	if _, err := os.Stat(d); errors.Is(err, os.ErrNotExist) {
+		err := os.Mkdir(d, os.ModePerm)
+		if err != nil {
+			log.Println(err)
+		}
+	}
+}
+
+// Get the file content type
+func GetFileContentType(ouput *os.File) (string, error) {
+	buf := make([]byte, 512)
+
+	_, err := ouput.Read(buf)
+	if err != nil {
+		return "", err
+	}
+
+	contentType := http.DetectContentType(buf)
+
+	return contentType, nil
+}