diff --git a/.gitignore b/.gitignore
index 6814e7fc..b474bd93 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,9 +18,10 @@ bin/
 /debug/
 /release/
 /.cache
+docs/diagrams
 
 
 # CLion
 
 .idea/
-cmake-build-debug/
\ No newline at end of file
+cmake-build-debug/
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1840e13d..47b8262c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -63,6 +63,7 @@ add_library(clang-umllib OBJECT ${SOURCES})
 add_executable(clang-uml ${MAIN_SOURCE_FILE})
 install(TARGETS clang-uml DESTINATION ${CLANG_UML_INSTALL_BIN_DIR})
 target_link_libraries(clang-uml ${LIBCLANG_LIBRARIES} ${YAML_CPP_LIBRARIES} spdlog::spdlog cppast clang-umllib)
+target_compile_features(clang-uml PRIVATE cxx_std_17)
 
 install(
         FILES
diff --git a/src/common/model/element.cc b/src/common/model/element.cc
index 5a83a2d2..a211bb19 100644
--- a/src/common/model/element.cc
+++ b/src/common/model/element.cc
@@ -44,8 +44,7 @@ void element::add_relationship(relationship &&cr)
     LOG_DBG("Adding relationship: '{}' - {} - '{}'", cr.destination(),
         to_string(cr.type()), full_name(true));
 
-    auto it = std::find(relationships_.begin(), relationships_.end(), cr);
-    if (it == relationships_.end())
+    if (!util::contains(relationships_, cr))
         relationships_.emplace_back(std::move(cr));
 }
 
diff --git a/src/main.cc b/src/main.cc
index 30da821e..b7691ad1 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -82,9 +82,7 @@ int main(int argc, const char *argv[])
     for (const auto &[name, diagram] : config.diagrams) {
         // If there are any specific diagram names provided on the command line,
         // and this diagram is not in that list - skip it
-        if (!diagram_names.empty() &&
-            std::find(diagram_names.begin(), diagram_names.end(), name) ==
-                diagram_names.end())
+        if (!diagram_names.empty() && !util::contains(diagram_names, name))
             continue;
 
         using clanguml::config::class_diagram;
diff --git a/src/package_diagram/model/package.cc b/src/package_diagram/model/package.cc
index aebeb79d..719689ae 100644
--- a/src/package_diagram/model/package.cc
+++ b/src/package_diagram/model/package.cc
@@ -34,7 +34,7 @@ std::string package::full_name(bool relative) const
     auto ns = using_namespaces();
 
     if (relative && (fn.size() >= ns.size())) {
-        if (starts_with(fn, ns))
+        if (util::starts_with(fn, ns))
             fn = std::vector<std::string>(fn.begin() + ns.size(), fn.end());
     }
 
diff --git a/src/package_diagram/model/package.h b/src/package_diagram/model/package.h
index eec76aca..50bc54ab 100644
--- a/src/package_diagram/model/package.h
+++ b/src/package_diagram/model/package.h
@@ -37,7 +37,7 @@ class package_trait {
 public:
     void add_package(std::unique_ptr<T> p)
     {
-        if (!contains(packages_, p.get()))
+        if (!util::contains(packages_, p.get()))
             packages_.emplace_back(std::move(p));
     }
 
diff --git a/src/package_diagram/visitor/translation_unit_visitor.cc b/src/package_diagram/visitor/translation_unit_visitor.cc
index affc47a1..88086760 100644
--- a/src/package_diagram/visitor/translation_unit_visitor.cc
+++ b/src/package_diagram/visitor/translation_unit_visitor.cc
@@ -97,11 +97,11 @@ void translation_unit_visitor::operator()(const cppast::cpp_entity &file)
                         auto usn =
                             util::split(ctx.config().using_namespace[0], "::");
 
-                        if (!starts_with(usn, package_path)) {
+                        if (!util::starts_with(usn, package_path)) {
                             auto p = std::make_unique<package>(
                                 ctx.config().using_namespace);
-                            remove_prefix(package_path, usn);
-                            remove_prefix(package_parent, usn);
+                            util::remove_prefix(package_path, usn);
+                            util::remove_prefix(package_parent, usn);
 
                             p->set_name(e.name());
                             p->set_namespace(package_parent);
@@ -306,8 +306,8 @@ void translation_unit_visitor::process_class_declaration(
     for (const auto &dependency : relationships) {
         auto destination = util::split(std::get<0>(dependency), "::");
 
-        if (!starts_with(ctx.get_namespace(), destination) &&
-            !starts_with(destination, ctx.get_namespace())) {
+        if (!util::starts_with(ctx.get_namespace(), destination) &&
+            !util::starts_with(destination, ctx.get_namespace())) {
             relationship r{
                 relationship_t::kDependency, std::get<0>(dependency)};
             current_package.value().add_relationship(std::move(r));
@@ -333,8 +333,8 @@ void translation_unit_visitor::process_function(const cppast::cpp_function &f)
     for (const auto &dependency : relationships) {
         auto destination = util::split(std::get<0>(dependency), "::");
 
-        if (!starts_with(ctx.get_namespace(), destination) &&
-            !starts_with(destination, ctx.get_namespace())) {
+        if (!util::starts_with(ctx.get_namespace(), destination) &&
+            !util::starts_with(destination, ctx.get_namespace())) {
             relationship r{
                 relationship_t::kDependency, std::get<0>(dependency)};
             current_package.value().add_relationship(std::move(r));
diff --git a/src/util/util.cc b/src/util/util.cc
index b84ec33c..37dc8699 100644
--- a/src/util/util.cc
+++ b/src/util/util.cc
@@ -146,5 +146,6 @@ bool replace_all(
 
     return replaced;
 }
+
 }
 }
diff --git a/src/util/util.h b/src/util/util.h
index d49c05e0..dd65930d 100644
--- a/src/util/util.h
+++ b/src/util/util.h
@@ -116,7 +116,6 @@ bool find_element_alias(
  */
 bool replace_all(
     std::string &input, std::string pattern, std::string replace_with);
-}
 
 /**
  * @brief Appends a vector to a vector.
@@ -148,6 +147,13 @@ bool starts_with(const std::vector<T> &col, const std::vector<T> &prefix)
         std::vector<std::string>(col.begin(), col.begin() + prefix.size());
 }
 
+/**
+ * @brief Removes prefix sequence of elements from the beggining of col.
+ *
+ * @tparam T
+ * @param col
+ * @param prefix
+ */
 template <typename T>
 void remove_prefix(std::vector<T> &col, const std::vector<T> &prefix)
 {
@@ -157,18 +163,27 @@ void remove_prefix(std::vector<T> &col, const std::vector<T> &prefix)
     col = std::vector<T>(col.begin() + prefix.size(), col.end());
 }
 
+/**
+ * Returns true if element exists in container.
+ *
+ * @tparam T
+ * @tparam E
+ * @param container
+ * @param element
+ * @return
+ */
 template <typename T, typename E>
 bool contains(const T &container, const E &element)
 {
     if constexpr (std::is_pointer_v<E>) {
         return std::find_if(container.begin(), container.end(),
-                   [&element](const auto &e) {
-                       return *e == *element;
-                   }) != container.end();
+                   [&element](const auto &e) { return *e == *element; }) !=
+            container.end();
     }
     else {
         return std::find(container.cbegin(), container.cend(), element) !=
             container.cend();
     }
 }
-}
+} // namespace util
+} // namespace clanguml
\ No newline at end of file