Add string type

Rakefile

@@ -1,3 +1,14 @@
+# MacOS:
+# ---
+# CC=gcc-14 CXX=g++-14 \
+# CFLAGS="-I/opt/homebrew/Cellar/flex/2.6.4_2/include" \
+# CXXFLAGS="-I/opt/homebrew/Cellar/flex/2.6.4_2/include" \
+# ../gcc-14.2.0/configure \
+#   --disable-bootstrap \
+#   --enable-languages=c,c++,elna \
+#   --with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX15.2.sdk \
+#   --prefix=$(realpath ../gcc-install)
+
 task :default do
   sh 'make -C build'
   sh './build/bin/elna'