Add test snippets class.

src/test/java/org/chulk/sanxbox/TestSnippets.java

@@ -0,0 +1,24 @@
+package org.chulk.sanxbox;
+
+import java.util.Arrays;
+import java.util.stream.Collectors;
+
+import org.junit.jupiter.api.Test;
+
+public class TestSnippets {
+
+	@Test
+	public void testStringConcat() {
+		String[] strings = { "apple", "banana", "cherry", "date" };
+		String delimiter = ",";
+		String firstDelimiter = ":";
+
+        String joinedString = Arrays.stream(strings)
+                .findFirst()
+                .map(s -> s + firstDelimiter + Arrays.stream(strings).skip(1).collect(Collectors.joining(delimiter)))
+                .orElse("");
+
+		System.out.println(joinedString);
+	}
+
+}