You get an array of numbers, return the sum of all of the positives ones.
Example `[1,-4,7,12]` => `1 + 7 + 12 = 20`
Note: if there is nothing to sum, the sum is default to `0`.
def positive_sum(arr):
    summ = 0
    for temp in arr :
        if temp > 0 :
            summ += temp
    return summ

def positive_sum(arr):
    summ = 0
    for temp in arr :
        if temp > 0 :
            summ += temp
    return summ
