Add header files

main.c

@@ -1,12 +1,19 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include "tm4c123gh6pm.h"
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
 
 #define MAX_FIELD_SIZE 100
 volatile char nmea_sentence[MAX_FIELD_SIZE];
 volatile uint8_t nmea_index = 0;
 volatile bool nmea_ready = false;
 
+
+
+
 void GPIO_PORT_F_init(void)
 {
     SYSCTL_RCGC2_R |= 0x00000020;             // ENABLE CLOCK TO GPIOF