Add fileExists utility function

backend/utilities/fileExists.go

@@ -0,0 +1,11 @@
+package utilities
+
+import (
+	"os"
+)
+
+// Checks if file on path exists or not
+func FileExists(path string) bool {
+	_, err := os.Stat(path)
+	return !os.IsNotExist(err)
+}

backend/utilities/fileExists_test.go

@@ -0,0 +1,27 @@
+package utilities
+
+import (
+	"os"
+	"testing"
+)
+
+func TestFileExists(t *testing.T) {
+	// Create a temporary file for testing
+	file, err := os.CreateTemp("", "testfile")
+	if err != nil {
+		t.Fatalf("Failed to create temporary file: %v", err)
+	}
+	defer os.Remove(file.Name())
+
+	// Test with an existing file
+	exists := FileExists(file.Name())
+	if !exists {
+		t.Errorf("FileExists(%q) = false, want true", file.Name())
+	}
+
+	// Test with a non-existing file
+	exists = FileExists("non_existing_file.txt")
+	if exists {
+		t.Errorf("FileExists(%q) = true, want false", "non_existing_file.txt")
+	}
+}