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Squashed 'libft/' changes from 7257042..8cce6fa

8cce6fa ft_putlstr
9f92f2c putnchar and small opti
59bc298 Add pair struct and functions
dd1571e 3 functions
4a3113f ft_atod

git-subtree-dir: libft
git-subtree-split: 8cce6fa989dca9e68e7f21aa660db4ab12dcc84f
Update libft
Test