[ox/std] Fix string append issues

deps/ox/src/ox/std/string.hpp

@@ -392,7 +392,7 @@ template<std::size_t SmallStringSize_v>
 constexpr BasicString<SmallStringSize_v> BasicString<SmallStringSize_v>::operator+(const char *str) const noexcept {
 	const std::size_t strLen = ox::strlen(str);
 	const auto currentLen = len();
-	BasicString<SmallStringSize_v> cpy(currentLen + strLen);
+	BasicString<SmallStringSize_v> cpy;
 	cpy.m_buff.resize(m_buff.size() + strLen);
 	ox::listcpy(&cpy.m_buff[0], m_buff.data(), currentLen);
 	ox::listcpy(&cpy.m_buff[currentLen], str, strLen);
@@ -425,7 +425,8 @@ constexpr BasicString<SmallStringSize_v> BasicString<SmallStringSize_v>::operato
 	BasicString<SmallStringSize_v> cpy(currentLen + strLen);
 	cpy.m_buff.resize(m_buff.size() + strLen);
 	ox::listcpy(&cpy.m_buff[0], m_buff.data(), currentLen);
-	ox::listcpy(&cpy.m_buff[currentLen], src.data(), strLen + 1);
+	ox::listcpy(&cpy.m_buff[currentLen], src.data(), strLen);
+	cpy.m_buff[cpy.m_buff.size() - 1] = 0;
 	return cpy;
 }
 
@@ -436,7 +437,8 @@ constexpr BasicString<SmallStringSize_v> BasicString<SmallStringSize_v>::operato
 	BasicString<SmallStringSize_v> cpy(currentLen + strLen);
 	cpy.m_buff.resize(m_buff.size() + strLen);
 	ox::listcpy(&cpy.m_buff[0], m_buff.data(), currentLen);
-	ox::listcpy(&cpy.m_buff[currentLen], src.data(), strLen + 1);
+	ox::listcpy(&cpy.m_buff[currentLen], src.data(), strLen);
+	cpy.m_buff[cpy.m_buff.size() - 1] = 0;
 	return cpy;
 }