OS excercises

Just some excercises from that class on the EIA university

Codes:

• change_a_e.c: Changes all the 'E's from a file to 'A's

• check_palabras.c: Checks if a a word is the same than the other (backwards)

• fibonacciGMP.c: Just Fibonacci series with BIG! Numbers

• count_a.c: Counts words with 3+ letters starting with A from a file

• prime_factors.c: Calculates prime factors of big numbers