* strncpy() refactor/fix

src/helpers/TxtDataHelpers.h

@@ -6,3 +6,8 @@
 #define TXT_TYPE_PLAIN          0    // a plain text message
 #define TXT_TYPE_CLI_DATA       1    // a CLI command
 #define TXT_TYPE_SIGNED_PLAIN   2    // plain text, signed by sender
+
+class StrHelper {
+public:
+  static void strncpy(char* dest, const char* src, size_t buf_sz);
+};