Solved issues reported by static analyzer

Makefile

@@ -7,7 +7,7 @@ example: cstring-example.cpp
 	./cstring-example
 
 tests: cstring-tests.cpp
-	$(CXX) -fsanitize=address -g $(CXXFLAGS) -o cstring-tests cstring-tests.cpp
+	$(CXX) -fsanitize=address,undefined -g $(CXXFLAGS) -o cstring-tests cstring-tests.cpp -lasan -lubsan
 	./cstring-tests
 
 coverage: cstring-tests.cpp
@@ -19,6 +19,10 @@ coverage: cstring-tests.cpp
 	lcov --remove coverage/coverage.info '*/cstring-tests.cpp' -o coverage/coverage.info
 	genhtml -o coverage coverage/coverage.info
 
+static-analysis: cstring.hpp
+	cppcheck --enable=all --inconclusive --suppress=unusedFunction --suppress=passedByValue --suppress=noExplicitConstructor --suppress=missingIncludeSystem cstring.hpp
+	clang-tidy cstring.hpp -checks='-*,readability-*,-readability-redundant-access-specifiers,-readability-identifier-length,-readability-braces-around-statements,performance-*,portability-*,misc-*,clang-analyzer-*,bugprone-*,-clang-diagnostic-error' -extra-arg=-std=c++20
+
 clean: 
 	rm -f cstring-tests
 	rm -f cstring-coverage

README.md

@@ -26,7 +26,7 @@ Main drawbacks:
 
 Drop off [`cstring.hpp`](cstring.hpp) in your project and start using the cstring.
 
-Read [`example.cpp`](example.cpp) file to see how to use it.
+Read [`cstring-example.cpp`](cstring-example.cpp) file to see how to use it.
 
 ```c++
 #include "cstring.hpp"

cstring.hpp

@@ -37,7 +37,7 @@ namespace gto {
  * @see https://en.cppreference.com/w/cpp/string/basic_string
  * @see https://github.com/torrentg/cstring
  * @note This class is immutable.
- * @version 1.0.0
+ * @version 1.0.1
  */
 template<typename Char,
          typename Traits = std::char_traits<Char>,
@@ -223,7 +223,8 @@ class basic_cstring
     basic_cstring(const_pointer str, size_type len) {
       if (len > max_size()) {
         throw std::length_error("invalid cstring length");
-      } else if (str == nullptr || len == 0) {
+      } 
+      if (str == nullptr || len == 0) {
         mStr = mEmpty.str;
       } else {
         size_type n = getAllocatedLength(len);