space at the end

lectures/01_introduction/README.md

@@ -267,7 +267,7 @@ object. There are several ways of constructing string objects:
   – By default to create an empty string: std::string my_string_var;  
   – With a specified number of instances of a single char: std::string my_string_var2(10, ' ');  
   – From another string: std::string my_string_var3(my_string_var2);  
-- The notation my_string_var.size() is a call to a function size that is defined as a member function of the string class. There is an equivalent member function called length.
+- The notation my_string_var.size() is a call to a function *size* that is defined as a member function of the string class. There is an equivalent member function called *length*.
 -  Input to string objects through streams (e.g. reading from the keyboard or a file) includes the following steps:
   1. The computer inputs and discards white-space characters, one at a time, until a non-white-space character is found.
   2. A sequence of non-white-space characters is input and stored in the string. This overwrites anything that was already in the string.
@@ -281,7 +281,7 @@ object. There are several ways of constructing string objects:
 (and length()).  
   – The :: notation means that size type is defined within the scope of the string type.  
   – string::size_type is generally equivalent to unsigned int.  
-  – You may see have compiler warnings and potential compatibility problems if you compare an int variable to a.size().
+  – You may see compiler warnings and potential compatibility problems if you compare an int variable to a.size().  
 
 ## 1.16	C++ vs. Java