verify that the input of characters contains only 0, 1 orspaces.

[shrewd pivot]

Hey, @crude seal!
Please remember to /close this post once your question has been answered!

[crude seal]

Your program should verify that the input of characters contains only 0, 1 or
spaces. You should also verify that every line of the matrix has the same length.
For example the input 10 00 111 is invalid because the 3rd line has 3 elements,
while the first two have only 2 elements

i need to do this but i am stuck at the 0s 1s and spaces