Optimal Way to remove duplicates in sorted array

def removeDuplicates(l):
    n = len(l)
    i = 0
    j = 0

    while j < n:
        cur = l[j]
        while j < n and l[j] == cur:
            j += 1
        l[i] = cur
        i += 1

    toRemove = n - i
    for _ in range(toRemove):
        l.pop()


l = [9, 9, 7, 7, 3, 1]
removeDuplicates(l)
print(*l)

# Output: [9, 7, 3, 1]