Let f:R→R and g:R→R be defined as $$ \begin{aligned} &f(x)=\left\{\begin{array}{lll} \log _e x & , & x>0 \\ e^{-x} & , & x \leq 0 \end{array}\right. \text { and }\\ &g(x)=\left\{\begin{array}{cl} x & , x \geq 0 \\ e^x & , x<0 \end{array} \text {. Then, gof: } \mathbf{R} \rightarrow \mathbf{R}\right. \text { is : } \end{aligned} $$