fixed a bug, where Char::operator= made the allocated data larger than

needed

Char.cpp

@@ -8,7 +8,7 @@ Char::operator char() const
 
 Char& Char::operator=(char other)
 {
-    auto data = new char[_string.size() + 2];   // space for new char & null-terminator
+    auto data = new char[_string.size() + 1];   // space for old string & null-terminator
     std::strcpy(data, _string.c_str());
     data[_index] = other;                       // set the desired char
 
@@ -17,4 +17,4 @@ Char& Char::operator=(char other)
     _string._str = new StringValue(data);       // make a new one
 
     return *this;
-}
+}