increase buffer for base64decoding and nulltemrinate anything we get

Changelog

@@ -2,6 +2,7 @@ Version 0.4:
 =============
 2026-04-17:
 - adding function to request a certain headline
+- base64decode increase the outputbuffer by 2 bytes for null-temrinated strings
 
 2026-04-16:
 - base64encode and base64decode implemented

ssl.cc

@@ -463,7 +463,7 @@ int base64decode(std::string input, char **obuffer, int *olen) {
 
 	// calculate and realloc size of buffer
 	if (*obuffer == NULL || (1 + ilen*3/4) < *olen) {
-		*olen = 1 + ilen*3/4;
+		*olen = 2 + ilen*3/4;			// increase buffer by two ... null terminated string?
 		*obuffer = (char*) realloc(*obuffer, *olen);
 	}
 
@@ -493,6 +493,7 @@ int base64decode(std::string input, char **obuffer, int *olen) {
 		(*obuffer)[ocnt++] = c;
 	}
 	*olen = ocnt;
+	(*obuffer)[ocnt] = 0;	// nullterminate - just to prevent unseen stuff
 	return 1;
 };