def flatten_matrix(matrix):
return "".join(char for row in matrix for char in row)
def main():
matrix = [
['H', 'e', 'l', 'l', 'o'],
[' ', 'W', 'o', 'r', 'l', 'd'],
['!']
]
output = flatten_matrix(matrix)
print("Flattened string:", output)
if __name__ == "__main__":
main()
'''
run:
Flattened string: Hello World!
'''