added b64 encode/decode to MString.

MString.cpp

@@ -2,6 +2,7 @@
 #include "Log.h"
 #include "uuid/uuid.h"
 #include "Exception.h"
+#include "Base64.h"
 #include <cstring>
 #include <string>
 #include <format>
@@ -365,21 +366,21 @@ namespace coreutils {
    }
       
    MString MString::toBase64() {
-      MString target;
-      return target;
+      Base64 b64;
+      return b64.encode(*this);
    }
    
    
    MString MString::fromBase64() {
-      MString target;
-      return target;
+      Base64 b64;
+      return b64.decode(*this);
    }
    
    
    MString MString::toUpper() {
       MString target;
       for(int ix = 0; ix < length; ++ix)
-	write(std::toupper(data[ix]));      
+	target.write(std::toupper(data[ix]));      
       return target;
    }
    
@@ -387,7 +388,7 @@ namespace coreutils {
    MString MString::toLower() {
       MString target;
       for(int ix = 0; ix < length; ++ix)
-	write(std::tolower(data[ix]));      
+	target.write(std::tolower(data[ix]));      
       return target;
    }