new fixes for lexing process, tests to go with them

src/str.rs

@@ -41,14 +41,13 @@ pub fn get_echo() -> Function {
                         Ctr::Seg(c)     => string.push_str(ast_as_string(c.clone(), true).as_str()),
                         Ctr::None       => ()
                     }
-                    
+                    string.push_str(" ");
                     return true;
                 }) {
                     // TODO: use custom logger
                     println!("Echo failure!")
                 }
-                
-                return Ctr::String(string);   
+                return Ctr::String(string);
             }
         )
     };