Improved MS Word document name extraction

Use document filename and not H1 title inside document.

Supports both Linux & MSFT.

domain/conversion/conversion_test.go

@@ -0,0 +1,53 @@
+package conversion
+
+import (
+	"testing"
+)
+
+// TestFilename validates filename extraction from path
+func TestFilename(t *testing.T) {
+	fn := "/var/folders/vx/lyhy36cn5kl994qj0pt6hgb80000gp/T/documize/_uploads/970f9d07-9bea-48a2-4333-b3c50bca42cd/Demo.docx"
+	t.Run("Test filename "+fn, func(t *testing.T) {
+		f := GetDocumentNameFromFilename(fn)
+		if f != "Demo" {
+			t.Error("Expected Demo, got " + f)
+		}
+		t.Log(f)
+	})
+
+	fn = "/var/Demo Docs.docx"
+	t.Run("Test filename "+fn, func(t *testing.T) {
+		f := GetDocumentNameFromFilename(fn)
+		if f != "Demo Docs" {
+			t.Error("Expected Demo Docs, got " + f)
+		}
+		t.Log(f)
+	})
+
+	fn = "Demo Docs.docx"
+	t.Run("Test filename "+fn, func(t *testing.T) {
+		f := GetDocumentNameFromFilename(fn)
+		if f != "Demo Docs" {
+			t.Error("Expected Demo Docs, got " + f)
+		}
+		t.Log(f)
+	})
+
+	fn = "/DemoDocs.docx"
+	t.Run("Test filename "+fn, func(t *testing.T) {
+		f := GetDocumentNameFromFilename(fn)
+		if f != "DemoDocs" {
+			t.Error("Expected DemoDocs, got " + f)
+		}
+		t.Log(f)
+	})
+
+	fn = "a\\b\\c\\DemoDocs.docx.ppt"
+	t.Run("Test filename "+fn, func(t *testing.T) {
+		f := GetDocumentNameFromFilename(fn)
+		if f != "DemoDocs.docx" {
+			t.Error("Expected DemoDocs.docx, got " + f)
+		}
+		t.Log(f)
+	})
+}