Add struct and its tests

tests/run

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+#!/bin/bash
+
+gcc work1.c -o work1
+./work1

tests/work1.c

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+#include "stdio.h"
+#include "string.h"
+
+struct person_tag
+{
+    char name[20];
+    char id[10];
+};
+
+struct course_tag
+{
+    char course_name[20];
+    int no_of_units;
+    int marks[4];
+    float avg;
+};
+
+struct student_tag
+{
+    struct person_tag student_info;
+    struct course_tag course_info;
+    struct student_tag *next;
+};
+
+int main()
+{
+
+    struct person_tag person, person2 = {"Chea", "4567892"}, *personPtr;
+
+    // strcpy style
+    strcpy(person.id, "2345678");
+    strcpy(person.name, "Sambo");
+
+    personPtr = &person;
+
+    printf("Hello, %s \n", person.name);
+    printf("Hello, %s \n", person2.name);
+    printf("Hello Ptr, %s \n", personPtr->name);
+
+    return 0;
+}