[Python] How to create overlapping diamonds

my task is to create n diamonds with height 2n-1 and b as blocks, that are overlapping in the middle like this. The overlapping point means that diamonds share blocks at the middle level.



so my current output looks like this



this is my code

def draw_diamonds(n, b):
height = 2 * n - 1
diamonds = []

for i in range(height):
line = ""
for j in range(n):
if i < n:
if j == 0:
line += " " * (n - i - 1) + b * (2 * i + 1)
else:
line += " " * (n - i) + b * (2 * i + 1) + ""
else:
if j == 0:
line += " " * (i - n + 1) + b * (2 * (height - i) - 1)
else:
line += " " * (i - n + 1) + b * (2 * (height - i) - 1) + " "
diamonds.append(line)

for line in diamonds:
print(line)

n, b = map(str, input().split())
draw_diamonds(int(n), b)

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