Remove the null terminator of string buffers

This applies in both constexpr buffers and non constexpr contexts, this was detected because Elixir would consider logs as binaries

include/gp/containers/buffer.hpp

@@ -22,7 +22,7 @@ namespace gp{
 		static constexpr size_t local_strlen(const char* str) {
 			auto ptr = str;
 			do{}while(*(ptr++));
-			return ptr-str;
+			return ptr-stro">-1;
 		}
 
 	public: