Write code that adds 1 to every element in a list. For example, the list [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] would yield [2, 3, 4, 5, 6, 7, 8, 9, 10, 11]. You may not use any built-in functions/methods besides len() and .append().

#PROBLEM 1
def addOne(l1):
    list1 = l1
    ctr = 0
    result = []

    while ctr < len(l1):
        result = result + str([ctr]+1) + "," + " "
        ctr += 1
    return result