commit 96982b9ae9fe79b480c13d17853c07b27c17624d
Author: Yi-Ting Shih <ytshih@it.cs.nycu.edu.tw>
Date:   Wed Oct 8 19:24:13 2025 +0800

    Feat: done

diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..2aa7d37
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "docs/template"]
+	path = docs/template
+	url = ../typst-template
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..bcd1473
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,16 @@
+.PHONY: all watch clean
+
+SOURCE := $(shell find docs/ -type f -name '*.typ')
+TARGET := docs/main.pdf
+TYPST_ARGS += --root .
+
+all: $(TARGET)
+
+docs/main.pdf: docs/main.typ $(SOURCE)
+	typst compile $(TYPST_ARGS) $<
+
+watch:
+	typst watch --root . docs/main.typ
+
+clean:
+	-rm docs/main.pdf
diff --git a/docs/main.pdf b/docs/main.pdf
new file mode 100644
index 0000000..a1482ee
Binary files /dev/null and b/docs/main.pdf differ
diff --git a/docs/main.typ b/docs/main.typ
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index 0000000..683b908
--- /dev/null
+++ b/docs/main.typ
@@ -0,0 +1,20 @@
+#import "template/module.typ": *
+
+#show: default.with(
+  title: "Golang Homework 5",
+  authors: ((
+    name: "Yi-Ting Shih (111550013)",
+    affiliation: "National Yang Ming Chaio Tung University",
+    email: "ytshih@cs.nycu.edu.tw",
+  ),),
+)
+
+== Code
+
+#code(read("../reverse.go"))
+
+This code doesn't allocate new memory except array subscript `i, l, r`.
+
+== Result
+
+#code(read("../result"))
diff --git a/docs/template b/docs/template
new file mode 160000
index 0000000..5a29091
--- /dev/null
+++ b/docs/template
@@ -0,0 +1 @@
+Subproject commit 5a290913a2b076125191ce8c1c46457e726b893d
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..b97b025
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module reverse
+
+go 1.25.1
diff --git a/result b/result
new file mode 100644
index 0000000..657b981
--- /dev/null
+++ b/result
@@ -0,0 +1,5 @@
+> go test -v
+=== RUN   TestReverse
+--- PASS: TestReverse (0.00s)
+PASS
+ok      reverse 0.001s
diff --git a/reverse.go b/reverse.go
new file mode 100644
index 0000000..e3b5a0d
--- /dev/null
+++ b/reverse.go
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+package reverse
+
+import "unicode/utf8"
+
+func swap(a *byte, b *byte) {
+	*a ^= *b
+	*b ^= *a
+	*a ^= *b
+}
+
+func reverse(b []byte) {
+	for i := 0; i < len(b); {
+		_, sz := utf8.DecodeRune(b[i:])
+		l := i
+		r := i + sz - 1
+		for l < r {
+			swap(&b[l], &b[r])
+			l++
+			r--
+		}
+		i += sz
+	}
+
+	l := 0
+	r := len(b) - 1
+	for l < r {
+		swap(&b[l], &b[r])
+		l++
+		r--
+	}
+}
diff --git a/reverse_test.go b/reverse_test.go
new file mode 100644
index 0000000..9e2eae2
--- /dev/null
+++ b/reverse_test.go
@@ -0,0 +1,21 @@
+package reverse
+
+import "testing"
+
+func TestReverse(t *testing.T) {
+	tcs := []struct {
+		input   string
+		expects string
+	}{
+		{"Hello 世界", "界世 olleH"},
+	}
+
+	for _, tc := range tcs {
+		b := []byte(tc.input)
+		reverse(b)
+		ret := string(b)
+		if ret != tc.expects {
+			t.Errorf("Failed to remove unicode space. Input: %s, expects: %s, results: %s", tc.input, tc.expects, ret)
+		}
+	}
+}