added UserDefined Module Naming

backend/service/functions/string.go

@@ -0,0 +1,22 @@
+package functions
+
+import "unicode"
+
+// check if course is empty or contains only whitespaces
+func CheckIfOnlyWhitespace(word string) bool {
+	for _, letter := range word {
+		if !unicode.IsSpace(letter) || !(letter == int32(160)) {
+			return false
+		}
+	}
+	return true
+}
+
+func Contains(s []string, e string) bool {
+	for _, a := range s {
+		if a == e {
+			return true
+		}
+	}
+	return false
+}