segmentation fault

pointer_fun_again.c

@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include <float.h> 
+#include <string.h>
+
+struct PlayStruct {
+    int int_value;
+    double double_value;
+    char* a_string;
+};
+
+void print_struct(struct PlayStruct ps, struct PlayStruct* pps) {
+    printf("Values of struct ps: %d, %lf, %s\n", ps.int_value, ps.double_value, ps.a_string);
+    printf("Values of struct pps: %d, %lf, %s\n", pps->int_value, pps->double_value, pps->a_string);
+}
+
+void change_struct(struct PlayStruct ps, struct PlayStruct* pps) {
+    struct PlayStruct new_ps = {ps.int_value + 1, ps.double_value * 2, ps.a_string};
+    *pps = new_ps;
+}
+
+void print_string(char* string_to_print) {
+    printf("%s\n", string_to_print);
+}
+
+void change_string(char* string1, char** p_string) {
+    string1[2] = '\0';
+    *p_string[1] = '\0';
+}
+
+int main(int argc, char* argv[]) {
+    struct PlayStruct play_struct = {1, 2.0, "3456"};
+    struct PlayStruct* play_struct_pointer = &play_struct;
+
+    print_struct(play_struct, play_struct_pointer);
+    change_struct(play_struct, play_struct_pointer);
+    //first value gets incremented by 1 & second value gets multiplied by 2 & the string wont be changed
+    print_struct(play_struct, play_struct_pointer);
+
+    print_string(play_struct.a_string);
+
+    char* string2 = "Test";
+    change_string(play_struct.a_string, &string2);
+    print_string(string2);
+    return 0;
+}