chapters/{memory-layout,stack}: Add tasks and reading material for C - Assembly interaction

Created standalone makefiles for solutions.
Added messages in readmes to point to the path of the exercices.
Modified `config.yaml` and removed guides from this lab.

Signed-off-by: cezar <savacezarmarian14@gmail.com>
Signed-off-by: Teodor Dutu <teodor.dutu@gmail.com>

Author: savacezarmarian14

chapters/memory-layout/c-assembly-interaction/drills/tasks/export-fix/README.md

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+# Repair Export Problems
+
+Navigate to `drills/tasks/export-fix/support/`.
+
+Each subdirectory (`support/a-func/`, `suppoer/b-var/`, `support/c-var-2/`) contains a problem related to exporting some symbols (functions or variables).
+In each subdirectory, run the `make` command, identify the problem and edit the files needed to fix the problem.
+
+If you're having difficulties solving this exercise, go through [this relevant section](../../../reading/memory-layout-c-asm.md) reading material.

chapters/memory-layout/c-assembly-interaction/drills/tasks/export-fix/solution/a-func/.gitignore

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+/main

chapters/memory-layout/c-assembly-interaction/drills/tasks/export-fix/solution/a-func/Makefile

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+../../support/a-func/Makefile

chapters/memory-layout/c-assembly-interaction/drills/tasks/export-fix/solution/a-func/hidden.c

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+// SPDX-License-Identifier: BSD-3-Clause
+
+int hidden_value;
+
+void init(void)
+{
+	hidden_value = 0;
+}
+
+void set(int value)
+{
+	hidden_value = value;
+}
+
+int get(void)
+{
+	return hidden_value;
+}

chapters/memory-layout/c-assembly-interaction/drills/tasks/export-fix/solution/a-func/main.c

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+// SPDX-License-Identifier: BSD-3-Clause
+
+#include <stdio.h>
+#include "ops.h"
+
+int main(void)
+{
+	set(10);
+	printf("get(): %d\n", get());
+
+	age = 33;
+	print_age();
+
+	return 0;
+}

chapters/memory-layout/c-assembly-interaction/drills/tasks/export-fix/solution/a-func/ops.h

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+/* SPDX-License-Identifier: BSD-3-Clause */
+
+#ifndef OPS_H_
+#define OPS_H_		1
+
+void init(void);
+void set(int value);
+int get(void);
+
+extern int age;
+void print_age(void);
+
+#endif

chapters/memory-layout/c-assembly-interaction/drills/tasks/export-fix/solution/a-func/plain.c

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+// SPDX-License-Identifier: BSD-3-Clause
+
+#include <stdio.h>
+
+int age;
+
+void print_age(void)
+{
+	printf("age: %d\n", age);
+}

chapters/memory-layout/c-assembly-interaction/drills/tasks/export-fix/solution/b-var/.gitignore

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+/main

chapters/memory-layout/c-assembly-interaction/drills/tasks/export-fix/solution/b-var/Makefile

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+../../support/b-var/Makefile

chapters/memory-layout/c-assembly-interaction/drills/tasks/export-fix/solution/b-var/hidden.c

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+// SPDX-License-Identifier: BSD-3-Clause
+
+static int hidden_value;
+
+void init(void)
+{
+	hidden_value = 0;
+}
+
+void set(int value)
+{
+	hidden_value = value;
+}
+
+int get(void)
+{
+	return hidden_value;
+}