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Compilation time: 0.12 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0,34 sec  
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Warning(s):
source_file.c: In function ‘main’:
source_file.c:34:5: warning: ‘p’ is used uninitialized in this function [-Wuninitialized]
     printf("Variable p antes de free(v) = '%s'\n", p);
     ^
Variable v antes de free(v) = 'sip'
Variable p antes de free(v) = '(null)'
Variable v después de free(v) = ''
Variable p después de free(v) = 'sip'