refactor: start to refactor project

testbench/yycc/string/op.cpp

@@ -0,0 +1,37 @@
+#include <gtest/gtest.h>
+#include <yycc.hpp>
+#include <yycc/string/op.hpp>
+#include <yycc/string/reinterpret.hpp>
+
+#define OP ::yycc::string::op
+
+namespace yycctest::string::op {
+
+    TEST(StringOp, Printf) {
+        auto rv = OP::printf(YYCC_U8("%s == %s"), YYCC_U8("Hello World"), YYCC_U8("Hello, world"));
+        EXPECT_EQ(rv, YYCC_U8("Hello World == Hello, world"));
+    }
+
+    TEST(StringOp, Replace) {
+
+    }
+
+    TEST(StringOp, Lower) {
+        auto rv = OP::lower(YYCC_U8("LOWER"));
+        EXPECT_EQ(rv, YYCC_U8("lower"));
+    }
+
+    TEST(StringOp, Upper) {
+        auto rv = OP::upper(YYCC_U8("upper"));
+        EXPECT_EQ(rv, YYCC_U8("UPPER"));
+    }
+
+    TEST(StringOp, Join) {
+
+    }
+
+    TEST(StringOp, Split) {
+
+    }
+
+}