refactor: split utils into smaller files

internal/utils/string_utils.go

@@ -0,0 +1,30 @@
+package utils
+
+import (
+	"strings"
+)
+
+func Capitalize(str string) string {
+	if len(str) == 0 {
+		return ""
+	}
+	return strings.ToUpper(string([]rune(str)[0])) + string([]rune(str)[1:])
+}
+
+func CoalesceToString(value any) string {
+	switch v := value.(type) {
+	case []any:
+		strs := make([]string, 0, len(v))
+		for _, item := range v {
+			if str, ok := item.(string); ok {
+				strs = append(strs, str)
+				continue
+			}
+		}
+		return strings.Join(strs, ",")
+	case string:
+		return v
+	default:
+		return ""
+	}
+}