Implementation of the printf function in C as exercise for the 42 school curriculum. Implements the following flags:
- %c Prints a single character.
- %s Prints a string (as defined by the common C convention).
- %p The void * pointer argument has to be printed in hexadecimal format.
- %d Prints a decimal (base 10) number.
- %i Prints an integer in base 10.
- %u Prints an unsigned decimal (base 10) number.
- %x Prints a number in hexadecimal (base 16) lowercase format.
- %X Prints a number in hexadecimal (base 16) uppercase format.
- %% Prints a percent sign.
- Bonus: Manage all the following flags: ’# +’ (one of them is a space)