create a header file for experiments.c source file (with prototypes and includes)

src/calibration/experiments.c

-#include <stdlib.h>
-#include <math.h>
-#include <assert.h>
-#include <stdlib.h>
-#include <stdio.h> 
-#include <time.h>
-#include "calibrate.h"
+#include "experiments.h"
+
 MPI_Request *req_array;
 #define tag 1
 #define datatype MPI_CHAR

src/calibration/experiments.h

+#ifndef __EXPERIMENTS_H_
+#define __EXPERIMENTS_H_
+
+#include <stdlib.h>
+#include <math.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <stdio.h> 
+#include <time.h>
+#include "calibrate.h"
+
+double get_Recv(int count, int nb_it);
+double get_iSendtime(int count, int nb_it);
+double get_PingPongtime(int count, int nb_it);
+long get_Wtime(int count, int nb_it);
+double get_Iprobe(int count, int nb_it);
+double get_Test(int count, int nb_it);
+
+#endif //__EXPERIMENTS_H_