[["\"\"\"\nWrite a python function to remove first and last occurrence of a given character from the string.\nassert remove_Occ(\"hello\",\"l\") == \"heo\"\n\"\"\"\normormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormormorm only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only only"], ["\"\"\"\nWrite a function to sort a given matrix in ascending order according to the sum of its rows.\nassert sort_matrix([[1, 2, 3], [2, 4, 5], [1, 1, 1]])==[[1, 1, 1], [1, 2, 3], [2, 4, 5]]\n\"\"\"\n at at at at at at feiririririririririririririrherherherherher who who who who who who who who who who who who who who who who fe fe fe fe fe fe fe fejjjjjjjjjjjjjjjjjjjjjififififififififififififififiriririririririrGGGGGGGedededededededededededededededededededededededededededededededededededededededededededededededededededededededededededededededededededededededededededededededededededededed"]]