update environment

Signed-off-by: Yi Qingliang <niqingliangl2003@gmail.com>
add translation.txt

Signed-off-by: Yi Qingliang <niqingliangl2003@gmail.com>
excersize 4.1 done

Signed-off-by: Yi Qingliang <niqingliangl2003@gmail.com>
add c code 'find_max_subarray'

Signed-off-by: Yi Qingliang <niqingliangl2003@gmail.com>