Change toString() to str() to better replicate the std

include/blt/std/string.h

@@ -26,7 +26,7 @@ namespace blt::string {
             void expand();
         public:
             void trim();
-            std::string toString();
+            std::string str();
             
             StringBuffer(){
                 characterBuffer = static_cast<char*>(malloc(BLOCK_SIZE));

src/blt/std/string.cpp

@@ -23,7 +23,7 @@ blt::string::StringBuffer& blt::string::StringBuffer::operator<<(char c) {
     return *this;
 }
 
-std::string blt::string::StringBuffer::toString() {
+std::string blt::string::StringBuffer::str() {
     trim();
     return std::string{characterBuffer};
 }