Move string functions to libstring

libstring/Makefile

@@ -0,0 +1,28 @@
+cc := clang
+o :=
+c :=
+cflags  := -isystem . -isystem ../libmsl
+buildtype ?= release
+
+include src.mk
+include ../generic/flags.mk
+include ../$(platform)/flags.mk
+
+all: build/libstring.a
+
+build/libstring.a: $(o)
+	llvm-ar rcs $@ $^
+
+%.o: %.c
+	$(cc) -c -o $@ $(cflags) $<
+
+%.o: %.S
+	$(cc) -c -o $@ $(cflags) $<
+
+clean:
+	rm -f $(o) build/libstring.a
+
+format:
+	clang-format -i $$(git ls-files '*.c' '*.h')
+
+.PHONY: all clean format