Update README.md

Author: Jenni-Foued

0x0D-preprocessor/README.md

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-# 0x0D. C - Preprocessor
+# <div align="center">0x0D. C - Preprocessor</div>
 
 ## About
 
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 [4-sum.h](https://github.com/Jenni-Foued/holbertonschool-low_level_programming/tree/master/0x0D-preprocessor/4-sum.h)  a function-like macro SUM(x, y) that computes the sum of the numbers x and y
 
-[101-preprocessor_abuse.c] a program that prints a string `Hello, Holberton\n`
+[101-preprocessor_abuse.c](https://github.com/Jenni-Foued/holbertonschool-low_level_programming/tree/master/0x0D-preprocessor/101-preprocessor_abuse.c) a program that prints a string `Hello, Holberton\n`