Added structs enums and stubs #t51

src/intermediate_code.c

@@ -0,0 +1,13 @@
+
+ void emit_binary_op(char* result, char* op, char* arg1, char* arg2){
+         return;
+ }
+ void emit_unary_op(char* result, char* op, char* arg){
+         return;
+ }
+ void emit_assignment(char* target, char* source){
+         return;
+ }
+void emit_as_file(FILE * out_file, Instruction * instr_arr){
+        return;
+}