Write a function in pure python to parse CSV data and return a $2$D array $-$ the output format must match what is expected by the automated test:

def my$\_$csv$\_$parser$($csv$\_$data, sep$)$:

$$ res $=[]$

$$ lines $=$ csv$\_$data.split$("\backslash$

$")$

$$ for line in lines:

$$ line $=$ line.strip$()$

$$ line $=$ line.split$($sep$)$

$",".$join$($line$)$

$$ res.append$($line$)$

$$ return res

# input: $"$a$,$b$,$c$,$e$\backslash$

$1,2,3,4\backslash$

$"$

# expected return: $[["$a$","$b$","$c$","$e$"],["1","2","3","4"]]$

# actual return out: $[["$a$","$b$","$c$","$e$"],["1","2","3","4"],[""]]$

# note the lack of spaces between elements and subarray; and the extra subarray