code: public Variable acquireLocalVariable(String name) {
          int depth = 0;
          LocalVariable variable = findVariable(name, depth);
  
          if (variable == null) {
              variable = new LocalVariable(name, localVariablesIndex, 0);
              localVariables.put(name, variable);
              localVariablesIndex++;
          }
  
          return variable;
      }
docs: Return an existing variable or return a new one made in this scope.