Removed dead code and improve test coverage

src/util/error.h

@@ -28,10 +28,4 @@ struct uml_alias_missing : public virtual std::runtime_error {
     }
 };
 
-struct substring_delimiter_not_found : public virtual std::runtime_error {
-    substring_delimiter_not_found(const std::string &message)
-        : std::runtime_error(message)
-    {
-    }
-};
 } // namespace clanguml::error

src/util/thread_pool_executor.cc

@@ -19,10 +19,6 @@
 #include "thread_pool_executor.h"
 
 namespace clanguml::util {
-thread_pool_executor::thread_pool_executor()
-    : thread_pool_executor{0}
-{
-}
 
 thread_pool_executor::thread_pool_executor(unsigned int pool_size)
     : done_{false}

src/util/thread_pool_executor.h

@@ -25,15 +25,13 @@
 namespace clanguml::util {
 class thread_pool_executor {
 public:
-    thread_pool_executor();
+    explicit thread_pool_executor(unsigned int pool_size);
 
     thread_pool_executor(const thread_pool_executor &) = delete;
     thread_pool_executor(thread_pool_executor &&) = delete;
     thread_pool_executor &operator=(const thread_pool_executor &) = delete;
     thread_pool_executor &operator=(thread_pool_executor &&) = delete;
 
-    explicit thread_pool_executor(unsigned int pool_size);
-
     ~thread_pool_executor();
 
     std::future<void> add(std::function<void()> &&task);

src/util/util.cc

@@ -191,20 +191,6 @@ std::string join(
     return fmt::format("{}", fmt::join(toks, delimiter));
 }
 
-std::string unqualify(const std::string &s)
-{
-    auto toks = clanguml::util::split(s, " ");
-    const std::vector<std::string> qualifiers = {"static", "const", "volatile",
-        "register", "constexpr", "mutable", "struct", "enum"};
-
-    toks.erase(toks.begin(),
-        std::find_if(toks.begin(), toks.end(), [&qualifiers](const auto &t) {
-            return std::count(qualifiers.begin(), qualifiers.end(), t) == 0;
-        }));
-
-    return fmt::format("{}", fmt::join(toks, " "));
-}
-
 std::string abbreviate(const std::string &s, const unsigned int max_length)
 {
     if (s.size() <= max_length)

src/util/util.h

@@ -96,15 +96,6 @@ std::vector<std::string> split(
 std::string join(
     const std::vector<std::string> &toks, std::string_view delimiter);
 
-/**
- * @brief Remove any qualifiers (e.g. const) from type.
- *
- * @param s String spelling of the type.
- *
- * @return Unqualified type spelling.
- */
-std::string unqualify(const std::string &s);
-
 /**
  * @brief Abbreviate string to max_length, and replace last 3 characters
  *        with ellipsis.